I've not had landline service in GU15 area since lunchtime, so I've since raised a 'Complaint' using VM online page hidden under the 'Contact Us' section at the bottom of the screen. This wasn't easy as they've corrupted the URL under the link!
My phone still not working this morning in GU15 area, but now VM's Service Status page has changed to read:
Phone Think something's wrong? Run test
Your loss of service has been successfully registered. If you're eligible for bill credit, it will automatically display on your bill. Visit our Help Page for more information on this. Make sure your contact details are up to date, so that we can keep you in the loop.
You might find that your Virgin Phone service isnt working at the moment. We are investigating and working to resolve as quickly as possible. Please accept our apologies for any inconvenience caused.