SEE UPDATE BELOW PICS
At last! Have literally looked at 100s of dresses and it's still early days but I'm keen to get this task done. Finding these was harder than finding my dress! Trying to please three very different people is not easy but we've cracked it. Also ordered the flower girl dress (which was much easier!).
The adult dresses are from Huiyunkitty, the lady who has a shop in Birmingham (I'm sure she's been discussed on here before) and a snip at £42.99 each. I'll let you know the quality once they arrive but the reviews I've seen are all good.
UPDATE: The adult bridesmaid dresses arrived today and I'm really pleased with them. The quality is much better than I'd hoped - they're thick satin and look much more expensive than the price I paid! The front is boned and shaped and the detail is exactly as the picture. They have a lace-up back which looks a bit confusing but will be ideal as my bridesmaids plan to lose a little weight so having an adjustable back is a bonus.
The girls are yet to try them on but just by looking at them I'm really pleased. I ordered standard sizes and they look to be slightly on the small side but the listing on ebay did specify this so there were no surprises.
I had a dress from Oriental Pearl for a friend's wedding a couple of years ago and although it was made to measure it was definitely no better quality than these dresses. Yet it cost over £200!
The ebay shop for anyone who's interested is:
http://stores.ebay.co.uk/huiyunkitty