for those that can't wait: the first batch of VW dealer demonstrators are starting to come on sale. We managed to get one rather than wait, however, be prepared to pay a lot. The VW id4 1st edition (77Kw battery, heat pump, 20" wheels) would have been around £38500 retail after the plugin grant (which was available in 2021) and we paid 43000 for the cheapest one in the UK with 6k miles. You may find a better price for different colour/options but they're not haggling on price.
The VW dealer had nearly all second hand cars in the showroom section. They rarely see new from factory cars at the moment.