For the IR at least, it makes a lot of sense to go train somewhere that doesn't stick VAT on top. The total cost also depends on how/where you do your hour-building - doing some of this overseas can help significantly, as can finding a friendly private owner who will do you a deal.
Some recent approximate costs (all courses assume minimum hours):
ATPL ground school + theory exams + initial class 1 medical: £3500
CPL(H) flight training including night rating and test: £11500(ish)
ME IR(H), done outside the UK, including twin rating: £38000
So, leaving aside the PPL and hourbuilding up to 155 hours, you're looking at around £53k. I believe a PPL in a R22 costs around £15k at the moment, so that's £68k, plus the cost of 100ish hours. Allowing £15k for the hour building takes you to £83k.
So I'd say £85k is a reasonable ball-park estimate. This number doesn't take account of additional ratings, or the bargaining skills of the individual in getting better hour-building rates. It assumes everything is done in minimum hours, with no resits. And it doesn't include an FI rating.