price differential is actually 'only' £16/hr
I realise I'm a bit spoilt in France, where a Cap 10B costs usually between £70 and £120 / hour dual, but the £185/hr charged for the White Waltham Cap seems excessive - even if the quality of what is being offered looks to be very good. (By way of comparison, Sherburn Aero Club in Yorkshire charge £120/hr dual.)
This is all the more the case at the moment, as the Cap is currently limited to +4.3g dual. This is very limiting for basic training.
Whatever you do, I'm sure you'll have a lot of fun!