Happy new year to you too.
Unfortunately, my personal opinion of Thorpe Lea is not positive.
Firstly, there was a KHV outbreak back in 2016. https://www.gov.uk/government/news/koi-herpesvirus-disease-outbreak-confirmed-in-surrey Personally, I won't go to anywhere I know has had KHV. It looks like the FHI have lifted the restrictions they had in place.
Secondly, it can be a bit of a scrum to get a swim at opening time.
Thirdly, you have to choose your swim when you arrive and it's marked off on a board at the entrance. If you go for a walk around, you could miss out on your favoured swim. It's probably less of an issue at this time of year.
Finally, back when I did try this place, fish were falling off my hooks all the time due to poor mouth condition. It is a commercial runs water and attracts the casual and less than attentive crowd.
I'm sure there are other places around that are better if you want a bend in your rod.