They include the seats held by the cabinet ministers William Hague and Liam Fox, as well as the constituency of the Labour leader, Ed Miliband.
"The constituency of the Labour party, the new participants, the Momentum group and so on … if there is to be a serious future for the Labour party that is where it is in my opinion," he said.
My own constituency, like 60% of Labour areas, voted leave.
As well as providing office space for small businesses, it houses the constituency party headquarters of Labour MP Angela Eagle.
This research shows something stark – that regardless of region, age, class or the type of constituency, the number of Labour voters who supported Remain vastly outstrips Labour voters who supported Leave.
Last week, at the outermost edge of the constituency, a group of Labour activists made a lonely picket outside Grantham Hospital's A&E unit, which is now closed overnight.
The Thurrock constituency is one of Labour's top target seats for 2015.
The campaign then moves on to Nevada and South Carolina, where there are large constituencies of unionised labour, Latinos and African-American voters.
Peter Tatchell, who stood as a Labour candidate in the 1983 by-election in the south London constituency of Bermondsey, said Labour bore some of the responsibility for the rise of UKIP.
