In article , mogga scribeth thus
As alluded to elsewhere they use the 868 MHz band and very narrowband tech and they won't be on all the time just now and again like most all other 868 MHz devices.
Such licence exempt devices have to accommodate the possibility of interference...
Ofcom let the use of power line adapters happen for wi-fi use so I rather doubt they'd be interested in this problem if indeed there is one ..