As a massage punter only, prices in my area (South Coast) were pretty standard when I started 10-ish years ago.
30 mins was £25, an hour £40.
Extras were HJ £20, B2B £40 and FS (where offered) £60. BJ and RO were either allowed as part of the B2B package, or charged at he FS rate, at the SPs discretion.
Nowadays, 30 mins is generally £30 (but I have seen £35) and an hour is £45 and even £50. I guess they also have bills to pay.
Extras have gone up accordingly, with £30 now standard for HE, and anything between £50 and £80 being asked for B2B. I am now much more inclined to haggle, but as said already, this can seriously curtail the SPs enthusiasm and hence your enjoyment of the experience. And even at the higher prices, "B2B" is often no more than lifting up the T-shirt and rubbing her tits on you for half a minute.
Apart from some notable exceptions, who should be treasured, the trend now seems to be to offer as little as possible for as much as you can get!