The Electoral Commission informs me that it wrote to Returning Officers for all UK parliamentary constituencies in September 2009 requesting information about when they intend to begin the counting of ballot papers for the UK parliamentary general election.
As of 21 October 2009, the Commission informs me that it had received responses from Returning Officers for 247 out of 650 constituencies. Returning Officers for 134 constituencies reported that they planned to begin counting on the evening of polling day. Returning Officers for 27 constituencies reported that they planned to begin counting on the morning of the day following polling day. Returning Officers for 86 constituencies reported that they had not yet decided when they would begin counting. Over the coming weeks the Commission will be actively seeking responses from Returning Officers who have yet to reply.
A spreadsheet detailing responses received by constituency, at 21 October 2009, has been placed in the House of Commons Library. This information is also available on the Commission website and will be updated regularly.