SIR – Your interview with David Cameron (“My plan to win back disgruntled Tories”, March 29) provides the most useful information so far in the election campaign; it clearly shows why the Prime Minister should continue in his role and reminds us that the alternatives are horrifying.

Ed Miliband is not fit to govern. Nick Clegg confirmed his lack of preoccupation with the electorate’s interests by refusing to support the revision of constituency boundaries. Nigel Farage will soon disappear.

The fear of a Labour alliance with the SNP is far less of a threat than some imagine; Mr Miliband knows that tying himself to Nicola Sturgeon would destroy the Labour Party.

I do not agree with all that Mr Cameron aspires to, but it is hard to deny that the Coalition has been, largely, a success. We should let Mr Cameron finish the job.

John Myatt

Stoke-on-Trent, Staffordshire SIR – Janet Daley (“Politics is now a puerile game – and we’re not playing along”, Comment, March 29) has got it in one. The major political problem in Britain is the current cult of “Self” and Tony Blair was its “true master”.

In his period in office Mr Blair oversaw the greatest reduction in public service ethos ever seen. Under his leadership, integrity and principles vanished while hypocrisy, greed, expediency and vanity blossomed.

The only leadership on display in Britain today that still demonstrates selfless concern for honour and duty is that offered by the Queen.

Linda Hughes

Newton Abbot, Devon SIR – Misguided attempts to distil the coming election down to a binary choice between two parties reinforce the false argument that a vote for one of the smaller parties is a wasted vote.

The Maastricht Treaty, which established the European Union, was passed by just three votes. If there had been two MPs from a minority anti-EU party in Parliament they would have been able to halt the Treaty in its tracks and Britain would be in a very different situation today.

Hugo Miller

Horsham, West Sussex SIR – When there was a possibility that Neil Kinnock could become prime minister, I started to make arrangements to emigrate.

I may finally have to see these plans through if Ed Miliband is to lead the nation with the backing of the Scottish National Party.

Ron Kirby

Dorchester, Dorset