Thank you for your email and for letting me know that you support the introduction of proportional representation. 

This is, of course, a long-running discussion, and it is a subject which will, I am sure, continue to be debated. 

There is much to be said on each side – but I don’t think that it would be sensible to engage actively in this debate while we are in the midst of a vigorous debate about the future relationship of the UK to the EU.