Honest question: are you certain no one's moving these things? I don't mean that as an insult, but one family member could be doing this subconsciously as a cry for help.
I've got a TriField TF2 (cost me £150 about five years ago) and honestly the main difference versus the cheaper models is consistency and the ability to measure different types of fields...
The mobile phone signal loss during the sightings is actually the most interesting detail here. That suggests electromagnetic disruption from whatever caused the lights, which rules out a lot of...
The 'wrong direction' detail is the bit that gets me. It's such an oddly specific thing to notice and it's the kind of detail that turns up in other London Underground accounts.
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