Really sorry to hear this Andy. On the plus side the PSA is still very low even if it is evidence of recurrence. This is definitely something to hang on to as curative treatment is still a possibility albeit with RT.
On the commute thing, I had my treatment at Clatterbridge on the Wirral and this was done in 20 sessions. It was a 70 mile return trip mostly on the motorway and it was doable for me as most of my sessions, being retired, were out of the rush hours. Towards the end I was getting a bit tired so I pulled off at Chester services for a quick Costa and a 10 minute nap which did the job.