I agree the £1 fee for pass holders is cheeky, it’s probably does break the T&C’s as “normal” days of operation aren’t classed as special events.I realise that there are bigger things to worry about, but this £1 booking fee per visit seems extremely cheeky and must surely breach the annual pass T&Cs.
For some (somewhat overly enthusiastic) people this could ultimately represent an extra £40-50 on top of the cost of an annual pass if it's kept indefinitely. Not insignificant.
I suspect this is the reason why they are doing a blanket extension of 5 months and further extension if your pass expires in the closed season.