We have been on three RS tours. The first two were to the Continent, and the latest one (this year) was to England. My memory may be fuzzy, but the buses used on the Continent tours were quite a bit more comfortable than the bus used on the England tour. The tour last year (to the Low Countries) used a Heidebloem bus; the tour this year used a Morton's bus. The Morton's bus did not have enough legroom for someone like me who has long legs. Of course, the bus was half full because of the small size of the RS tours, so I could prop up my legs on the adjacent seat. But this shouldn't be necessary.
No beef with our bus driver. He handled the bus on narrow English streets with aplomb, worked well with our tour guide, and engaged with the tour members (when he wasn't driving).
Anybody have a similar experience?