Landing lights are an airmanship issue. As long as they're off by 10'000ft it's pilot discretion at easy when they're used. In London TMA I try to leave them on if there is a lot of traffic, as even if you can see other aircraft on TCAS, it's nice to be able to pick them out against the sky so you can see which way they're actually flying - TCAS isn't THAT accurate for tracks. For small airfields I put them on below 10'000ft so that GA traffic can see me, I would hope they also have their lights on so they can be seen.
I tend to turn them off in situations such as cloud, speeds above 250kts and low visibility (to help pick out runway lights and avoid the reflecting light blinding us.)
PA's for pilots at easy are up to the individual. Yes I'm boring and say the same stuff every time. Normally boarding, TOC and TOD if a long sector or just TOD for a short one.