I am 187cm. I made it to final interview qith QCCUK. It is pretty hard not to stand up straight. The thing kind of wobbles, and someone is usually looking at you from the side. Infact I think they made me stand up so straight that I was taller than I normally would be when walking around the cabin! I questioned them on the height thing later, and they said it is because of the B744 UD Galley! I have been flying on B744 for a few years, and never had any problems!
Go for it! Be positive, but not disapointed if they send you away! Lots of other airlines in the UK!