A relative of mine has a Wylex NHRS6606 split load CU (i.e. main switch and one RCD), probably from around 2003, and it is fitted with the likes of the NSB32 MCBs. I don't have a picture of the inside, nor can I expect them to safely do that, so I was wondering if anyone knows if the recent range of compact RCBOs (NHXS1B32 and similar) will fit its busbar?