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Thanks Bruce. In the wordpress settings it does not seem to allow me to add further subdomains. Only to include alias (www.waxwingenergy.co.uk)
However, I see now it says to include subdomains like mail.... you must use the DNS challenge method. But when I try to do that it can not achieve the DNS challenge ( i don't really know what this means. However my domain provider did tell me the other day that my DNS settings are hosted with a different provider to met website. maybe this is why.