The UK may be divided into 650 constituencies, but the next election will be decided in somewhere between 50 and 100 of them – roughly a tenth of the total.
Last time around, in 2017, 70 seats changed hands, and the Conservatives lost their overall majority, ending up with 317 seats while a resurgent Labour took 262.
A string of close finishes last time means there are 97 marginal seats that will change hands on a swing of 5% or less – and 31 of those are “hyper marginals”, held with a wafer-thin 1% majority.
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Target seats source: http://www.electionpolling.co.uk