Avgas (For piston aircraft) Varies from £1.15 - £1.50 per litre. depending mainly on location but also on the deal you have with the supplier based on frequency and quantity of purchases. (inc VAT)
Like wise for Jet A1 (For jet/turboprop/and diesel piston aircraft) prices vary dependant on loaction, purchase quantities and frequency. Typically £0.35 to £0.50 per litre. (no VAT on Jet fuel). You get a good deal if you operate a 747 transatlantic and buy 130 tonnes a time (150,000 litres ish)