Tizard?
If you are going to mention radar then you should include Sir Henry Tizard in that as well. It is also worth noting that the Frisch–Peierls memorandum came about as a result of both Frisch and Peierls being excluded from work on radar due to their German nationality. Tizard was sceptical of the likelihood of an atomic bomb being developed, reckoning the odds of success at 100,000 to 1, and gave Frisch and Peierls this project to see if they could prove him wrong.