Watchdog also had a new (or at least the first time I've seen it) production credit - BBC Features Production London, presumably related to departments moving out of TVC?
Watchdog's production department wasn't based at
TVC - they were only there for the studio days (and for some series picture editing was also there).
The bulk of the production teams were based in the Media Centre (after moving out of White City - aka White City One) but Watchdog has now moved to Broadcasting House with most of the rest of the London Factual department (including Science, Arts etc.)
AIUI the new end boards are a result of the total restructuring of BBC Vision - where the production departments are now managed by pan-regional "genre groups" (i.e. Science, Art, History, Features etc.) rather than by individual genre groups in each region/nation as before. This was an aim to reduce the number of managers and to co-ordinate internal production - as part of Delivering Quality First (I think)
So, for instance, now whether a science programme is made in London or Scotland, it is effectively made by the same "genre department" (BBC Science), with a single head of genre, though it may be made by a different team in the department based in a different geographic location.
Presumably the BBC is no longer embarassed by how many programmes it makes in London (which is what BBC Productions used to be shorthand for) so is happy to put London on the end boards?