You can overfly the park, no issues, if bylaws prevent you from taking off in it. Although as the CAA I think class it as a toy the rules may not even apply - I guess it depends upon the wording…
In the A1 legacy you can fly almost anywhere, but you should avoid overflying people if possible. There isn’t a 50m requirement with the mini 2 - there is for larger drones if flown in A2 category with an A2 CofC qualification - within A3 you need to be 150m.
See this post which has some images from @kvetner and this post also from @kvetner which shows the various open categories that the drones falls in to.
This all applies from 31st December 2020.
Hope that helps and welcome once again.