Less low turnout?

We've received the following email from the person in charge of the count in Camden:

Following advice from the Regional Returning Officer in the light of the higher than anticipated turnout and also taking account of the ballot paper size, the Local Returning Officer has decided that the start time for the count of votes for Camden is to be put back to 4.30 pm on Sunday 7th June at the Camden Centre.

Higher than anticipated turnout? What does he know that the media speculators don't? Presumably a lot, as they started to "verify" the votes (ie check the number of ballot papers against the number issued) yesterday.

It is not clear whether this applies just to Camden or to the whole of London.