Try Tough Leads or Screw fix. Make sure it is rated for a constant 13A and fully unwind it.

 

Operating at a constant 13A is asking for trouble. Get a unit limited to 10A, which is the norm. Don't use an extension lead.

 

Granny EVSE supplied with UK cars are normally 10A 2.2kW but you should over rate the extension lead if you have to use one.

 

Overrated or not, they'll be no thermal management in the extension lead plug.

 

Can anyone point me to a simple short adaptor, for type 2 to 3 pin?

They do not exist, you need a EVSE for 3 pin socket, many cars include one, otherwise look at Screwfix or similar.

Masterplug 10A 2300W Mode 2 Type 2 Plug Electric Vehicle Charging Cable 5m - Screwfix

Order online at Screwfix.com. Portable Mode 2 charging cable that delivers safe and intelligent EV charging for Type 2 electric vehicles. 5-metre cable length and charges at a rate of 13A/3.1kW. Weatherproof and IP66-rated with a LED charging status indicator and overload protection. FREE next...

www.screwfix.com

 

If your using a 13A socket to charge make sure the outlet is a good quality one like MK etc, when you first use it check to make sure the plu in the outlet isn't getting hot, it should just be mildly warm to the touch. I use one of the laser temperature guns you can buy on EBay/Amazon for under a tenner.

 

You cannot join a 13A plug charger lead to the type 2 lead that comes with the car to make it longer.

edit - there is no such thing as a type 2 to 13A adapter, instead it is a portable EVSE fitted with a 13A and tethered type 2 plug - known as a granny charger, or emergency charger, which is why it is setting you back £100.

 

If you only need it short term, do you know anybody who could lend you one. Or alternatively there's a few used units on E-bay.

 

If it’s only for a short while, is it feasible to use a nearby charge point? This is what we did, albeit we were lucky that there are both 7.2kW slow chargers within walking distance, and various 150kW Osprey and Shell fast chargers only 5 minutes drive away. It worked out fine for the couple of months before we got our home charge point installed.

This isn’t mutually exclusive with having a Granny Charger, but in practical terms you may find it actually easier/quicker to do a lot of your charging at a public site.

 

If it’s only for a short while, is it feasible to use a nearby charge point?

That's what we're doing whilst waiting for our install in Jan. The nearby town has a nice shopping centre with safe underground parking - £1 per day on Sundays - and a row of well spaced empty 22kW AC charge points. 20 to 95% in the time it takes to do a bit of shopping and grab a Greggs.

 

It's a very good idea to have a Granny charger anyway even after you install your proper chargepoint. It's a get-out-of-jail card since you can pick up an emergency charge virtually anywhere if you are stuck.

Or at your granny's, even!

 

This is the piece of kit I like:

Customized 22kw 3phase Portable Electric Car Charger Manufacturers, Suppliers - Factory Direct Wholesale - Teison

As one of the most professional 22kw 3phase portable electric car charger manufacturers and suppliers in China, we're featured by quality products and low price. Please rest assured to buy or wholesale cheap 22kw 3phase portable electric car charger from our factory. Also, customized service is...

www.teisonev.com

It has assorted adapters to covers all sockets.
UK version probably quite a bit more expensive:

3 Phase EV Portable Charger with Time Delay | Type 2 to Power Plug Adapter Set | 6A to 32A Variable | 22kW | 5 Metre

Type 2 Premium Portable EV Charger with LCD Display and Power Plug Adapter Set | 6A to 32A Variable | 380V | 22kW Mobile charging solution that allows you to safely, quickly and conveniently charge your electric vehicle in locations without a dedicated EV charging station. Adjustable phase and...

thirdrockenergy.co.uk

 

Most UK domestic supplies are not 3 phase.

 

I fear that there might be a bit of confusion about your enquiry. You appear to be saying that the car only comes with a Type 2 to Type 2 cable for use when using public AC chargers. And you ask if there is some way to use that same cable but with an extra short 3pin 13 amp extension cable to plug into the house mains.

That is not possible.

The T2 to T2 cable can only be used when plugged into a Type 2 socket such as with a home charge point or a public AC point.

To use the home 13 amp socket you will need another cable entirely. One that has a built in EVSE box along the cable so that the safe and correct signalling between the socket and car is carried out. Those are available in various lengths. These come in 5 metre, 7.5 metre, and 10 metre lengths. Do not use a normal mains extension cable though. Buy the complete unit at a size to reach the car on its own.

EV Home Charging Cable | Type 2 to 3 Pin Plug

 

Get a granny cable that can be dialled back below 10 amps - even 10 amps is pushing your luck on a 3 pin plug. 3rd Rock Energy do one that can be set for 6, 8 and 10 amps. If you get an extension cable then get one designed for the job - from Toughleads, and keep the current set down to 8 amps maximum.

 

Some (if not all) of the Hyundai / Kia OEM ones can be set to 6,8 or 10A via a button on the unit, It's why I prefer to carry one of those around instead of the one that came with my MG.

That said I've used it maybe once when on holiday set to 6A and the socket was still warm after woods.

 

I used a similar Kia one in holiday on my MG5 at 8A.

 

Thanks for all you advice which I have read eagerly.
I am a complete newbie and wrongly assumed I can just add an adaptor on the end of the existing cable, but I understand that the load in terms of current and duration, prevents this.
I've gone for a charger that will work at 6,8, & 10 amps and incudes a temperature cut out.
I've learned a lot from this thread, so thanks again to all who have contributed.

 

You're missing that you need what's known as a 'granny cable' (what you need to charge when you visit granny). 13A plug on one end and a Type 2 connector on the other - with a box in-between to communicate with the EV. You may also need an extender cable (Tough Leads, Screwfix?). Check that your 13A socket and wiring can take ~10A continuously. Check for overheating on fuses and cable (extension fully uncoiled). You may need to dial down to 3kW in either the car or the granny cable.

Don't chance it with some cheap option.

 

Uncoiled or not, using an extension really must be avoided other than in an emergency because of the lack of thermal management in the plug.

3kW is not a reasonable (or desirable) expectation.

 

There are three types of AC charging, mode 1, mode 2 and mode 3.

In mode 1, the car is connected directly to a domestic AC outlet. The car draws a limited current so it isn’t going to overload the supply but at the same time the low current means it charges slowly and so this arrangement limits the practical capacity of the battery.

To get over this problem, there needs to be a way for cars to draw high current from supplies that can provide it but reduce the current they draw from low power supplies. In other words, the supply needs to be able to tell the car what it can safely draw. Enter the EVSE (electric vehicle supply equipment), which is a box that knows the capacity of the supply and can communicate this to the car. The car always controls how much current it draws but it won’t draw more than the EVSE tells it the supply can handle.

To allow a car to be charged from a domestic outlet, you have a mode 2 device, which has a domestic plug wired to a box that can communicate with the car. Mode 2 is the proper name for granny chargers.

Alternatively, you can put in a decent sized supply wired directly to the EVSE communication box and stuck on the wall with either a charging socket or a cable to connected to the car. That’s mode 3.

 

I've reported the above post by @islajackson with the dodgy links