Kirstey,
For what it's worth, a best case go around in a 757 would put you in a visual circuit, 2-3 mile final (a small dig at you 5 mile c152 boys!)
This would use about 850 kgs of fuel. At 40 pence a litre this would cost around £300.
Just a little bit more than the Shoreham landing fee I think, mind you I haven't been there for a few months......
Further food for thought; we tend to turn up at a destination with around 3.5/4.0 tonnes of fuel.