TTB
I'm not sure that it is still possible to get the restriction for being in sight of the surface lifted. It certainly was possible if you had a CAA licence, as opposed to JAR licence. Once you had a night rating you asked the CAA to re-issue your licence with the restriction removed and you were then legal to go VFR on top. I don't think it is possible to do this any longer now that CAA only issue JAR licences.