I went there for the carnival special. The venue itself is big and versatile. Others probably had a better overall experience than I.
Unfortunately I lost some expensive sunglasses when I was there. The bouncers were nasty and unhelpful when I wanted to go back inside to look for the sunglasses I had mislaid. After making me wait for half an hour until closing time, they then shut the doors and told me to phone up instead, reassuring me of Islington metal works' good reputation.
I emailed and then phoned up the lost property on 4 separate occasions; the woman on the phone each time seemed uninterested and patronising. No-one seemed to have a desire to help on any occasion. After 3 weeks, I can assume my sunglasses lost or in the possession of someone else, when quite easily the issue could have been resolved with a tiny bit of assistance.
This review relates specifically to the staff; the venue as bricks and mortar is probably one of the best.