Exfoliate and moisturise as much as possible, perhaps use a fake tan to top it up.
Take selenium supplements, and start using a gentle fake tan - Johnson and Johnson do a fab one.
you should exfoliate but not with things like apricot scrub, you should use a milder one, like garnier, i forget what its called but its yellow. the beads in the exfoliator should be small, other wise they do actually encourage skin to peel off, if you use a milder one then this just gently brushes the dead skin away and leaves the nice stuff. Holland and barrat do these tablets aswell that contain copper which are good at making a tan last longer. i wor at a beauty counter so i get asked this stuff all the time but just usually encourage people to buy expensive fake tans!!!!!
Get on the sunbed once in a while to top it up!!! But not too much otherwise you'll look like a handbag by the time your 30!
wouldnt bother...tans look silly on british girls
Moisturise moisturise moisturise!!! Don't exfoliate as it takes off the top layer of skin, in other words you are just scrubbing your tan away. For future reference, make sure you exfoliate just before you go on holiday so that your new skin gets tanned and not the old skin thats ready to be shed anyway. That'll make it last a bit longer.
You can buy 'corrector towels' from Boots and Superdrug - they're about 99p each.
top your tan up, if the sun ever comes out in this place. I find any tan i develop fades pretty much as soon as i leave the country.