A catastrophic election defeat could lead to the parliamentary Conservative party tilting towards the populist right, Guardian analysis has indicated.

A projection of the seats the Conservatives would retain if there was a further two percentage point swing to Labour before election day, using data from Electoral Calculus, shows that about 40% of the remaining MPs would come from this wing of the party.

In less calamitous defeats – scenarios based on current polling levels, and on a situation where there is a two percentage point swing in favour of the Tories – the proportion would be nearer to 30%, roughly where it is now.