You're correct, surgery involves a lot more people, BUT it is a standard procedure and should not take 150 days to organise.
In just over a week from changing from Surgery to RT I have had a prelim injection by the Oncology nurse, had another one scheduled with my GP on the 31st of October, had a meeting with the Oncology consultant to discuss treatment and had a telephone call from "a leading cancer care hospital" to book me in for the initial scan.
If I'd been told on July 5th that surgery would be in December (rather than the initial Sept/Oct suggested by the Surgeon) I would have been part way through my RT by now !