However if you *MUST* use 55-0-55V site power, and need to feed 110V to multiple instruments, consider using a 120V rewireable inline GFCI imported from the US (they call RCDs GFCIs), feeding an imported US socket strip (with breaker for overload protection), and US 3 pin (NEMA 5-15) plug to C14 trailing socket leads for your individual instruments. It avoids putting 110V on BS1363 or European socket strips, and if you attach the C14 end of the lead to the equipment with a lanyard to a large self-adhesive cable tie base, vastly reduces the risk of equipment configured for 110-120V being plugged into a 240V wall outlet.