Think we tracked the issue down, one of my other sites

which lives on the same server.
Anyway, sorted that out so it shouldn't happen again...
...but still...we're going to move LG to it's own server over the next few days/week anyway...
This will be additional cost to me/us but we have more than enough in the kitty to cover it for a long time.
I'll shout up if the kitty gets low!

Thanks again and sorry for the issues.