*Keep your guest list to close friends and family only, and forget about 'traditional' wedding things like fancy cars and favours, which are not important.
Organising a good old party for a select guest list can be done on £1000 can't it!*
Agree with overmy. I bargain hunted right, left and centre for my wedding and called in a lot of favours.
We were married in my local Catholic church, and the priest told us that, as it was our church, there was no need to make any donation. This was very, very kind, but we gave him £250 in the end, as we could afford that.
My dress was £140 from Ben de Lisi at Debenhams and it was bloody gorgeous, if I do say so. 
Shoes £14 in Debenhams sale.
One bridesmaid, my DSis - her dress was £50.
We hired a lovely municipal hall, which wasn't too dear. It was a bit shabby, but a lovely old Victorian building, and we loved it.
DH's friend DJed for us in exchange for DH DJing at his wedding.
I made our invites in the letterpress room at my old art school, and the technician wouldn't take any money from me, as I'm an ex-student.
A friend did us a great buffet at mates' rates.
Just call in as many favours as you can and don't be fooled by hotels/venues trying to sell you 'packages' as they will rip you the fuck off!