First of all, don't hurry to sell your Porsche. Assuming you live in the ULEZ zone and are registered for the residents' Congestion Charge discount, you'll be entitled to a 100 per cent discount until October 2021. There are a few companies around converting classic cars to electric, but I'm not sure they'd offer a conversion for your Boxster. If you could find somewhere to store it outside of London, that might not be a bad idea - an early Boxster will be at the bottom of its depreciation curve, so might go up in value. There are quite a few about, though, so it probably won't become a serious investment any time soon - and you'll have to keep on top of maintenance, too.

I'm not sure you'll be able to find a direct modern, hybrid equivalent to your Boxster, unfortunately. The Hyundai Ioniq Hybrid is a very good hybrid car, but it's more of a family car than a two-seater convertible. A BMW i8 Roadster might appeal, but it's not cheap - starting at around £127,000. I'd look for something like a new Mazda MX-5 - it's petrol, not a hybrid, but it does meet the ULEZ standards so won't be subject to a charge.