Assymmetric Drift,
I think I have seen the same myself. I don't think it is a laser, but I believe it is part of a Christmas decoration (no, really) on Bishop Auckland (I think) Town Hall. It appears to be a bright white focussed light beam that revolves and pitches up and down. It was certainly there a couple of years ago.
Having said that, I have been illuminated by a laser while on finals to NCL 07 green laser from the right. We reported it, but I heard no more.
TH
