Friends of ours got married abroad so avoided all the usual ceremony costs - no car hire, bridesmaid dresses, suit hire for ushers etc. They had a reception at a weekend when they got back - it was in a local sports club in a nice park near their house, the kind of place where drinks cost pennies and isn't that expensive to hire even on a weekend. They did a cold buffet - nothing fancy, but plenty of it (which is more important
). They did all invitations etc by email so no costs there either.
I think they had fizz for toasting but other drinks were up to the guests. It was really good fun and much more relaxed than some weddings - some people (including the bride) were fully kitted out, while others (inc the groom) were in jeans. They had the usual speeches (which were brilliant) and music from an iPod, so no DJ costs and all music to their taste, and I think their cake was homemade or provided by a friend. So ticked a lot of the traditional wedding boxes at very low cost. I don't remember much in the way of special decor, so none of the usual flowers/seat cover etc costs (the bride did have a bouquet to toss, but again, not the usual expensive-looking bouquet, could have been a bunch from the supermarket for all I knew and no one cared, it was just for the toss!), and some of our friends are keen photographers so brought their fancy cameras and the photos we saw looked great (although progressively less in focus!) so no photographer costs. I'm sure they didn't spend much but it felt like they put a lot of effort in, and it was such a fun and relaxed night and didn't feel 'less of a wedding' than a big fancy celebration in a posh hotel in the middle of the countryside.
From a guest point of view, it was miles easier to get to/from than a lot of traditional wedding venues - plenty of public transport and close to city centre too, and we probably spent much less on taxis and buying our own drinks than we would have on a normal night out, considering how much some bars charge. Although I couldn't tell you what we spent, as we were having too much fun to notice or care, it definitely wasn't much, and at some weddings we've spent £50+ for a few basic drinks at the hotel bar, so better all round!
HTH and good luck with your wedding 