Thank you everyone. Yes Load and Feed were in the wrong terminals.
I did not help matters by placing Multimeter in Hold Mode so it gave a constant reading. I could not find the live wire.
But all sorted now.
Thanks
I know I'm not completely daft.
I've removed two 8 year old time switches on towel rail (lighting circuits) and replaced them with Timeguard WiFi Switches. I even remembered how to use my Multimeter to find the live circuit.
But somewhat overconfident I have removed the 5 year old Timeguard...