Some years back I was involved in renting at 172 at about $100 US per hour, no instructor.
Fuel, maintenance and the 100 hr check was around $60 per hours.
Insurance was 8K pa which tended to be another 20-30 per hour.
All these numbers will have gone up. That was fuel at $3/gallon!! I'm sure today in the UK this will all be higher in GBP
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After instructor and overrhead there won't be a lot left on a warrior at 135 GBP per hour. 15-25 per hour sounds good if they can do it. It all depends on getting enough hours.
20driver