From what I've heard, £1,000 is a pretty standard price for a wedding photographer... a quick Google search suggests that you should budget £1,000, but that the average price for the photographer is about £1,200 and some charge upwards of £2,000.
A friend of mine is planning her wedding and she said she found that only the cheap/not so good photographers advertise their prices on their websites... so she got an idea of price online, but then found out that the good photographers were much more expensive than she was expecting!
I'm sure you can get cheaper photographers than that, but then again, their photos may not be as good as more expensive ones, so I guess it just depends on your budget and how high a priority the photos are for you.