I had a TURP in May 2016 after being diagnosed Oct 2015. Started on the bical/HT right away. Put forward for TURP as flow not good & RT would make it worse & be a problem. I was advised would have to wait for the 'wounds' to heal, couple months at least for RT. As it happens I started RT Nov 2016 for personal reasons, nothing to do with treatment etc. I was quite happy to delay RT as onco & everythig else suggested no worries. So, generally, there is likely to be couple of months delay for healing before RT.
PETER