Go on the old bufty forum (nostalgia).
And offer to take some of the retired on some trips.
Their is so much experence on PPrune and the retired pilots really do have alot to give in the way of experence.
You could also use the time to go and visit the various CPL/IR schools around the UK.
And make sure you don't slip on your NAV. Plan every trip and be very critical of your own performance.
A couple of hours with a CPL school instructor might be an investment as well. Take on what they suggest you are needing to work on and perfect it.
MJ