So for those of you interested here’s the Manufacturer’s response:
“We state to connect direclty to a non-switchable relay spur to avoid instances where the unit is inadvertently turned off, there are also regulations relating to power connections within domestic bathrooms that apply; for these reasons we suggest to avoid a standard plug connection.”
So it’s now safely wired to a regular plug and functioning without issues.
Thanks to all for your help
“We state to connect direclty to a non-switchable relay spur to avoid instances where the unit is inadvertently turned off, there are also regulations relating to power connections within domestic bathrooms that apply; for these reasons we suggest to avoid a standard plug connection.”
So it’s now safely wired to a regular plug and functioning without issues.
Thanks to all for your help