I had a TURP in 2016 prior to RT (which started Nov 2016, delay not for any specific reason). Leading up to the TURP, I self characterised which was no problem after first couple of goes must admit I was quite anxious but after that it was fine. Was also on Tamsulosin leading up to the op.
Op no problem. I hadn't had any stage in hospital before then fortunately. Stayed in 2 nights, catheter in until after 2nd night, they checked I could empty bladder etc and discharged early afternoon. I was advised that some time in future may need to have another TURP.
The RT I think has an effect on uretha so if there's an issue before RT there may be a bigger issue during/after treatment.
Peter