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if you remove the mains to the panel does this still occur. This will show if the 'noise' is coming in via the mains supply or another way

Hi Sixwheeledbeast, Many thanks for the advice. I am more comfortable now I can forget the Scantronic option. I do not intend to try a DIY installation. I do intend to have the cabling in place myself. I took your advice that there is no such thing as cannot. Rather than trying to use the original cables for the three daisy chained sensors, I looked at covering two of the rooms from alternative accessable points. By coming from the loft I can cut through the first floor in cuboards to lay two new sensor positons, leaving just one of the three sensors on the original 6 core. The issue with my semi engineering brickwork was not how to break through them, that's already done. The issue is they seem to be Wi-Fi unfriendly. Sky mesh was a disaster for me. I feel more comfortable now that I can install a wired system with options to Wi-Fi extend if the need arises. Thank you once again.