With regards the G68, if the sizes of compatible linear PSUs that Nick has found are typical, then it going to be a very tight fit for an internally fitted unit which raises concerns over cooling etc. An external Naim style solution may be an option. I'm not brave aenough to mess around. If mine goes, I'll probably replace it with the switched unit that Meridian fits

Main system - Sources (Kodi-HTPC, Vero 4k, FireTV, Sat) into Trinnov Altitude 32 (8-16) (+Roon), Trinnov Amplitude 8 amp & Vivid Audio (Giya G3, V1.5) and REL Stentor III speakers. Others: F80 + Raspberry Pi and other Pi systems.