Would never pay £5000 for a fuck. Like I said, you could have 100s of punts with that budget, depending on what you look for.
Indeed, look at the alternatives.
80 - £60 for 30 mins punts and still have £200.
50 - £100 for 1 hour punts (punt once a week for a year).
Go to Berlin to punt and have a month you'll never forget.
Go to Thailand to punt and have 4 months you'll never forget.
£5000 for one night is insane, but some mug will pay it!