Chris, G0FDZ, the beacon keeper of the GB3VHF 144MHz beacon reports it as off air at the moment.
Unfortunately, there has been an equipment failure of the power supplies. No particular problem - Chris has the bits to mend it! However, unfortunately, due to the very wet weather, it's not possible to get in the door, as it has swollen!
See the service updates page for GB3VHF
From the pictures, particularly the fallen oak tree, it would appear that the weather at the site has been very bad recently.