As promised:
Landing Fee: £14.75 per tonne or part thereof (so the C172 will put you in the 2 tonne bracket.
Parking: First 2 hours free, then £10.00 per 24 hours (for aircraft up to 2.5 tonnes).
Plus, if anyone's interested - training:
Singles up to 2.5 tonnes - £7.00 per approach
Twins up to 2.5 tonnes - £11.50 per approach
Minimum charge 2 approaches
Add VAT at 17.5% if applicable (Uncle Gordon gets his cut too

)