Tell me about it Apparently when we first started thinking about getting foldies to go on holiday my wife went on the website and specced up her ideal Brompton. I think she got very close to £2000! Even second hand basic models can go for upwards of £500. I guess that makes them a reasonable investment, but it makes it hard to get on the ladder...!
I'd consider bromptondock as an alternative if there's one close by: at only £2.50 a day it's a very reasonable price for bike hire. The only issue for me is that they're the L-spec with front luggage clip rather than R-spec, so you have to have special brompton luggage to carry your bikes on them. If they did the R-spec so you could use ordinary panniers they'd be ideal (IMNSHO).