RV Formation days
There is also a regular monthly formation flying day held in RV's at North Weald. On the off chance that you have one of these or access thereto... Similar instructor line up to the bi-annual formation week flown in 52's, 300's or anything other type that you can rustle up more than one of...
I'm not sure of the next RV date but I think it is the first weekend in December.
As someone who's introduction to formation flying via the North Weald weeks led to regular formation display flying, I can whole-heatedly endorse the quality and enjoyment of those weeks. Its worth waiting for and you can work up a DA, even for simple formation fly-pasts, via those courses.
SC.