Guys
From the DFT website:
no person shall, during the course of his working time, act as a member of the cabin crew employed by him on board an aircraft registered in the United Kingdom if during the period of twelve months expiring at the end of the previous month the aggregate of that person's block flying time exceeds 900 hours, and
no crew member employed by him shall have a total annual working time, including overtime and any period spent on standby during the period of twelve months expiring at the end of the previous month that exceeds 2000 hours.
For a direct link to the DFT web site click
here
The 900 hours limit applies to not just flight deck, but to cabin crew as well.