Looks like there's problems in the DomainMonster.com camp today. Their phones are coming back as temporarily unavailable, and whilst their website is working, mail servers seem to be down. The it-mate.co.uk incoming mail server is through DomainMonster, and sporadically failing, which sadly means I can send e-mails (different server), but can't receive them.
I've tried both numbers available for DomainMonster, but neither are working at present. I'll post an update when I find out what's going on.
/edit 21:31 17-01-2012
Not sure what was wrong, but whatever it was, seems to be fixed as everything seems to be working again.