About £600 13 years ago. Lots of flowers from a local florist. Roses, peonies and sweet peas. Sweet peas were grown by the florist. She was a diamond - they were spectacular!
Had some ridiculous quotes - 2k or when I mentioned a budget just that they could do it for the price.
I didn't just go on price. She was most up for collaborating with all the bits I'd put /scavenged together for decorations (teacups, cake stands, birdcages, pearls, fabric etc). It was a very cliched vintage-style wedding 
My florist was just starting out at a new shop at a garden centre and gave me a very detailed costing. I think she got another 5 or 6 weddings from mine.
I'd still use her today if she was closer (took on another shop 30 miles away), although still use her for big bouquets.
Just meet as many florists as possible, go and see them. Don't discount start ups on industrial parks over high st shops.
An alternative is getting the bouquets done by a florist and table centres by yourself/friends. I've done this a few times and it can look great with a smidge of planning.