7.1.5 UK.
The week before BST our phones changed time but 7940's 7911's were affected differently. I found a timezone for "Legacy phones" which fixed the issue.
After BST all phones were an hour behind, I installed the DST patch and restarted the servers but time is still 1hr behind.
So I have had to fudge the timezone with a +1 zone for the time being...
Rob