right price for a 1 hour punt? A rule of thumb might be the price of a half hour booking plus 50%.
This is because half hour punts, even if they don't run over, take up time while she gets one punter out the door and another one in, stopping to freshen up with a wet wipe and straighten the bed. One hour punts often finish on time or early, they often include more unnecessaries, and the admin time of comms and confirming the booking is the same for a half hour punt, not double.
The exception is maybe girls who prefer half hour punts (some do: no emotional or play-acting demands, just sex) and only charge 60 or less for the half hour. On a general scale, 90 for an hour looks cheap, so she bumps it up to 100, which also helps deter the longer punt that she might not be keen on.
In Scotland at least, anyone charging more than 120 for an hour is considered off their trolley by most UKP veterans as you can find damn good girls (looks+service) for 120 or less and you'd have to be a bit obsessed about a particular WG to pay more. Personally I think paying anything over 95 quid for a shag in any circumstances is a bit obsessive, though I've made an exception for LMP which gives good value, and for foreign brothels purely in the interests of research. But that's just me. If you are Richard Branson or David Cameron, I'm sure someone else looks after the little nitty-gritty of payments and you don't really give a fuck what it costs.