hi enid, a slow evening couldn't resist checking out gee brothers and lo and behold they are just near us and in fact i checked them out when searching for wedding stationary for our wedding!
agree they are much cheaper than smythson (but you did say "posh"!) and have an excellent reputation.
we didn't use them in the end - i can't remember why. we ended up making our own - i wouldn't recommend this option unless you are both v. creative and v. handy... ours were adequate (no better i'm afraid) and we ended up saving the grand total of £50 quid. i can't for the life of me think why we thought it was a good idea... lord knows we didn't cut any corners with the rest of the wedding!
anyway, good luck and would love to hear about the dress, flowers, decorations etc. if you want to discuss...