It's the High Neck Skater Dress from ASOS own brand and it was in the outlet for £12.50.. Bargain :)
I was a bit disappointed as the colour looked extremely white on the website, but I realised it clearly stated Grey on the colour chart.. doh! Never mind, I'll still get use out of it. I thought I would team it with my silver flat forms and metallic black socks. Annoyingly I have no silver accessories, so it does look a bit bare at the moment. What do you think?