Hmmmm... I'll have to try it, I know, but he's a way away so it could be a while before I get a chance to go collect it.  My mains setup is, fyi, 4x6mm 32A spurs into double MK unswitched sockets, dedicated Memera 2000AD6 consumer unit.  So, a little bit up from just a dedicated spur on a shared CU, but is the filtration and isolation really necessary...??