Wasn't at Lemp last weekend but I've been following reports from that place for a couple of years now. The staircase activity there is really well documented, loads of people have captured orbs on the stairs as well.
What kind of footsteps was it - heavy, slow, or more like someone pacing? I ask because I've read accounts where people describe two very distinct types and they seem to correspond to different parts of the building. Would love to know if anyone managed to get any photos or audio from the visit. Even background noise on a mobile recording can pick up things you didn't catch at the time, worth having a listen back if you havent already.