@ninabreznik It took about an hour in direct sun, today is very clear, no clouds. It might take two hours in an overcast day. We made brussel sprouts when it was 4'C outside, in a totally overcast day, and they turned out great. I'm pretty sure it would work in england too.
https://100r.co/site/solar_cooking.html
@neauoire This is absolutely amazing. Love it, glad you found out about it as I can imagine it can be pretty annoying without an oven for a long time.