My experience of Rolec cables are that they aren't great, TBH, the one I had twisted up internally and ended up looking like it was full of knots. I'm not a fan of Chinese cable in general, and especially not the Chinese stuff that Rolec use.
Agree with all the above about this being a dead easy and quick job, and the new cable does need ferrules crimped on the ends, easy enough to do and any electrician should have a ferrule tool and box of assorted ferrules. It's perhaps worth buying a cheap ferrule kit like this one for less than £8, delivered: 1200X Crimp Tool W/ Bootlace Ferrule Crimper Plier Wire Terminal Connector Kits | eBay
as ferrules make a tidy job of terminating any stranded wire.
The very best cables I've found come from these people: Unique Tesla charging cables - evChargeking
I have no connection with them at all, other than as a customer.
Their cable is European made, very tough and quite stiff, so doesn't tend to get tangled or twisted, like some of the very soft cables. Buying a cable with the connector already fitted makes the job nice and easy to do, as most of the time is spent crimping the terminal pins within the connector, a job that needs a pretty heavy duty crimping tool.