I bought a fused spur timeswitch for heated towel rail to replace current fused switch. It's in zone 3, other end of bathroom from sink etc. Current fused switch is on a ring main so has 4 earths connected, it is a plastic back box. The new Timeswitch doesn't have earth connection points. What's the best thing to do with the earths? I can't terminate to backbox or switch - is this okay? I assume only option is to connect all 4 earths in one connector block but not sure there is room in the box? Any advice will be appreciated.