One of the most infuriating aspects of this year's general election isn't the spontaneity of it's calling or the fact that it appears to be a foregone conclusion, but the fact that that the outcome of the last one is still being investigated .

This followed earlier fines of £20,000 for Labour and the Liberal Democrats respectively for similar misreporting of election spending returns.

Police have not named either the MPs nor the election agents under investigation, but races in up to 20 seats are believed to be under scrutiny.

There were 96 seats won by the Conservative Party in 2015 whose boundaries fall within the boundaries of the police force areas named by the CPS.

Questions of legitimacy

Will the Prime Minister give a guarantee that no Tory MP who is under investigation by the police and the legal authorities over election expenses in the last general election will be a candidate in this election? If she will not accept that, this is the most squalid election campaign that has happened in my lifetime.

The prime minister responded.

I stand by all the Conservative MPs who are in this House and who will be out there standing again, campaigning for a Conservative Government who will give a brighter and better future for this country.

What seats could these include?

At present only 20 are believed to be under investigation.

One significant accusation was that campaign battle buses should have been counted in local candidate spending in individual seats, and not in the party's 'national campaign' spend.