SamuelCB:
OK perfect, thanks very much again! Is there a way of finding out if the relay I have bought has one built in? Or should I just do it anyway lol?
Well the picture you linked to in the first posting does show a diode on the board (two terminal device with M7 printed on it). I suspect that all those asian Ebay relay boards do include a protection diode across the relay coil winding. My two relay board certainly does.
Lefty