* British opposition party calls for Speaker to step down

* No confidence vote seen over handling of expenses scandal

* Speaker Michael Martin to make statement to MPs on Monday

(Updates with comments from MP, details of further newspaper report on MPs' expenses)

By Matt Falloon

LONDON, May 17 (Reuters) - The leader of Britain's third main party on Sunday called for the House of Commons' Speaker to step down and said parliament may need to be dissolved in the wake of an expenses scandal that has shaken its reputation.

The highly unusual attack on the Speaker, Michael Martin, by a party leader underlined the pressures on British politicians to try to rebuild public trust after 10 days of damaging media disclosures about extravagant expenses claims by members of parliament.

Newspapers said Queen Elizabeth had expressed concern to Prime Minister Gordon Brown over the disclosures, which have angered Britons at a time of recession when thousands are losing their homes and unemployment is rising sharply.