I read somewhere that the Head has moved to a school closer to where he lives with his young family (seems fair enough). It's another school in the same trust so they obviously have faith in him.
Not sure about the deputy, but fairly common for both to go at same time either because the deputy went for the headship and didn't get it or because the change at the top triggers itchy feet.
Watch out here on Mnet as there have been a few sock-puppet accounts set up with a grudge against RPA over the years - possibly disgruntled ex-staff from when they had a clear-out and parents angry about a bullying issue. Lots of schools have that sort of thing going on though, so don't let it put you off. I don't know the school personally but it's popular in the area.