You want cheap weddings, I'm your girl. You will probably find the venue has a checklist of the usual things, ask the person who deals with the bookings.
We asked my sister inlaw, who is a press photographer, and a friend who teaches art to do the photos. They gave us the films as a wedding present. This meant we just got them developed, put them on CD at the same time and only printed up the ones we really wanted.
Marks and Sparks for the cake too. I went to the flower market the day before and bought red and white carnations. I just scattered these round the cake. Nobody realised it wasn't an expensive one.
I took a bus to my wedding, but that was because the cars we booked failed to turn up. Remember to ring them again the day before and remind them! In the end it was quite funny, we took a bus, while dh and his best man walked (fast) and the best man split his trousers in the process. It wasn't till afterwards that someone explained to me why he had his jacket tied round his waist at the ceremony
We made our own invitations using Microsoft Publisher. I scanned a picture of myself and dh looking drunk and happy to use on the front and printed them out on nice paper bought of a 3 for the price of 2 special at WHSmiths.
Decide what is important to you, then factor that into your budget. In our case it was lots of drink and nice rings. We weren't fussy about clothes (a bit difficult when you're 6 months pregnant) or flowers, so we spent very little on them.
We had our rings designed and made specially. In essence this did not cost any more than buying them off the shelf and we have ended up with really special rings that people always comment on. Try one of the independant jewellers in town. We had ours made by a jeweller in Coin Wharf on the South Bank.
Ask if the registrar will come out to the venue for the ceremony itself. We got married on a Sunday, so it cost about £300 for this service, but the upshot was everything was in the same venue, so there was no hanging around or organising cars and transport. We did the deed, walked to the next room where champagne and nibbles were laid on. We stayed about 20 minutes, the, as the guests got stuck in, we nipped out to have photos done. Very few people noticed we were missing.
Remember this is your day. Don't let anyone tell you what you can and can't do. Rope friends and family in to help, it makes the whole thing more personal, and you could always ask for their help as a wedding present if you're not fussed about material things. Overall, think of what makes a good party in you and your partner's eyes, then use that as a blueprint. Oh.....and we expect to see photos afterwards.