Punting is a luxury hobby and if we going to cut back due to cost of living (COL) this would normally be the 1st thing and working girls would react by lowering the price.
Those are are in the higher end market £250+ an hour will continue to charge those fees and those that can afford it will continue to pay as COL would barely affect them.
Those in the mid range £150-£200 may need to be smart on their pricing and service, some SP got away with average service for years and I doubt they will improve their service, there's somethings people just don't have it in them and being a SP is an extra income for them.
I'm aware of few girls I punted or on my hotlist stopped working and these I included in the list been doing this for 2 years plus (many reasons not just lack of business or COL).
With London being a global city and one of the better places to live and earn a living I can see constantly fresh supply and those that do well will stay and earn their living. Just think of it as any job, if your good at it you stay and get rewarded with pay rise if not you change jobs or work harder, longer hours and improve your skill set.