Last time I flew BRS-AMS-STR, it was the same aircraft and crew on both sectors. We had to be bussed into D, do passport control, do security, hammer over to B (or A?), and get bussed back out again. I remember commenting breathlessly to my equally breathless colleague that it had taken us 40 minutes to get back to the exact same seats.
I think the MCTs at AMS are very optimistic, particularly as they land (sterile) UK arrivals into the (non-sterile) Non-Schengen zone, which forces a wholly unnecessary security check when transferring to Schengen zone countries. ZRH and MUC are examples of airports where this doesn't happen, so 30 minute MCTs are more realistic.