Jaecoo have had the best selling model in the UK for two or three months running now. I have no idea how you managed to lose your bet. My experience is closer to the parent post - pull into any car park in the UK and you'll count more Chinese EVs than Teslas, often you can count more Jaecoo or BYD than Tesla.
I tested this theory on a short drive to the bakery yesterday by counting the Teslas and Chinese brands coming in the opposite direction. Even I was surprised that the result was 3 Teslas to 23 Chinese brands (not including the western brands now Chinese owned like Volvo, Polestar, Jaguar Landrover etc., though I did include MG as they basically just bought the badge in that case).