Nice scheme. Liverpool Tool Library have one in their collection too.
I found a brick over the underfloor ventilation had fallen in using mine, as there was a big unexplained cold spot behind the skirting board.
Cardiff Library Service allows you to borrow a thermal image camera - see what I found when I borrowed one. (1min 40s) https://youtube.com/shorts/aP7ECAydyIg?si=jrbprX1Uq77UFrOa
