Ok, I am not sure exactly what this is called but I have one for sale. I wore it on the big day so it's pretty much unused. It cost me £40 so anything @ £10 would be fine with me - collection only though (London, SW18 1JN). I am a size 8-10 and 5ft 2 (though wore it with 3" heels which I guess means it is fine for anyone up to around 5ft 5).
Thanks ladies and happy planning - it's definitely worth it!
x