Well done, that's a fantastic loss! I'm similar to you - have been up and down, up and down, and I'm now only 1lb lighter than I was in the first week of January!
Did you do anything different this week? Or just stuck to plan 100%? I don't think I'll get anything like 7lb off next Tuesday, but I'm aiming to take a decent chunk out of the 9.5lb I've re-gained.