SIR – I am not sure how Dr Peter Sander (Letters, October 1) justifies his assertion that demographic changes in parliamentary constituencies “have left a bias in Labour’s favour”.
At the June election, it took 43,122 votes to elect each of the 317 Conservative MPs, but 49,154 to elect each of the 262 Labour MPs.
Had the number of votes needed been equal, at 46,138, then we would now have just 296 Tory MPs but 279 Labour MPs.
The first-past-the-post electoral system results in biases at different times towards each of the two main parties.
Pity the Liberal Democrats, whose 12 seats required 197,659 votes on average. On the other hand, the Scottish National Party needed only 27,930 votes for each seat.
Bishops Stortford, Hertfordshire