My own personal blog. UNISON NEC Member & National Convenor, Newham Councillor for West Ham Ward, Vice Chair of Local Authority Pension Fund Forum, Pension trustee, Housing & Safety Practitioner. Centre left and proud member of Labour movement family. Strictly no trolls please.
"A striking aspect of the 2017 general election was that the result in lots of constituencies was very close.
The normal working definition for a marginal seat is one where the majority is under 10%, which usually means under about 5,000 votes - although that does depend on turnout and the size of the constituency.
Then, within that group of seats, there are the ultra-marginals: places where the majority is under 2% - about 1,000 votes.
In 2017 there were 51 of these ultra-marginals - considerably more than in previous elections. In fact there were eight seats with a majority under 50.