We spent about 8k if I recall correctly and had a fairly small wedding (about 50 guests) from what I have seen and unless you really scrimp and save I think it would be fairly hard to come in under 5k these days for a wedding of that size.
That sounds pretty much spot on.
I'm getting married (again) next June. We're getting married in Dovedale on the Staffordshire/Derbyshire border, and the whole do is going to be outside. Obviously, you can't bank on the British weather giving you a rain-free day, so we looked at hiring a marquee. Hiring a marquee to fit 80+ guests isn't cheap. You're talking a few grand. Ridiculous money. So instead we've bought a special "stretch-tent" (for a similar cost to hiring one) that we plan to sell after the wedding and recoup the cost of that.
We're not paying for a church or anything, as we're having a humanist ceremony in the grounds, but we still have to get legally married at a registry office, and that itself costs a few hundred quid.
We're doing something quite different with the food and drink for the wedding, but that can easily cost a fair whack, especially if you're at a posh venue.
A decent photographer can cost well over a grand, same for a videographer. A disco will cost you a few hundred, and if you want a live band, that can cost a chunk as well.
It can easily add up, and that's even if you keep things relatively simple. For a small and modest wedding, I think you're looking at £3k, but if you have forty plus guests and you start adding on "extras", I reckon that a "typical" wedding would be in the region of £10k.