Not sure if it will work, but there is i believe a legal phrase "time is of the essence", if you give them a reasonable deadline (after this time I would say a week), and use this phrase then you can claim compensation (I would think at least all the money you have spent flying their aircraft above what you would have spent if it had been the group aircraft). I would suggest you go in and either use this, making sure they know the consequences and/or advise them you will go to trading standards. I am not a lawyer though so do not take this as gospel. I would normally be very reluctant to take things this far but it certainly sounds like you have been waiting long enough.
Good luck.
Last edited by foxmoth; 14th August 2012 at 10:03.