A few things that you may care to consider before spouting off ...
1. When did LHC last put up their prices, and how often?
2. Other factors determining their operating costs that LHC can't control e.g. landing fees, rent imposed, maintenance costs.
3. Jet A1 may have gone down but Avgas is on the way up again.
Which would you rather ... paying another £20 per hour or losing yet another helicopter operator from the South of England and having to drive further to get to another school because they've had to shut up shop.
There is no legal requirement to notify customers of price increases and you had well better check your knowledge of consumer law if you believe you have a legal right over money you've paid up front.
There ARE NO wealthy helicopter schools and I get the impression you are accusing the owners of profiteering.
Cheers
Whirls
PS - I have never flown with LHC, neither do I know the owners but I do understand a little about running an aviation business.