At least you won't have any wasted cycles if you don't ovulate on the low dose! I've heard a lot of USA ladies say they get started on 100mg because more ladies take 100 to ovulate than 50!! Maybe your doctor is ahead of everyone else in the UK!
As long as your being monitored (which you must be if you're getting the trigger) it'll be fine!!! We don't get offered any of that here in Derbyshire!!
Isn't it strange how much it differs throughout the UK, even though we are all the same National Health Service? I am from the US originally but have been living in the UK for the past 5 years (and LOVE the NHS by the way!) but am quite shocked at how much the service varies from PCT to PCT.
I would rather not have a multiple pregnancy, but I've been trying so long at this point, I will be happy with anything.
Good luck for all the ladies testing soon