I contacted the company that Jason linked to and they stock cut strips (100mm wide 3m long) of the exact material I am looking for. However they are unable or unwilling to give me the name of their supplier or even what the material is called, as far as they are concerned its just 'skirting laminate'
TBH their supplier might not be able to help as the sales person I spoke to said they had tried to get 150mm wide strips from them and been told (the warehouse) only stock 100mm.
I'm pretty certain the strips are cut from large sheets as visually the long edges appear to have been sawn whereas the ends are definitely unfinished.
Its frustrating to know this material exists and that regardless of what search terms I the only hits are to partition skirting (and there are not many of those).
Black glass Tufnol sounds interesting, presumably, even though black its RF properties would be OK, the control unit has an 868MHz transmitter and a 433MHz receiver (common low power remote control frequencies).
Ian P