JOHN Home Robertson, MSP for East Lothian, will not seek reselection for next year's Scottish parliamentary elections.

Mr Home Robertson, who has represented the Scottish parliamentary constituency since 1999, will tell the East Lothian Constituency Labour Party tomorrow night that he intends to stand down.

The MSP's decision to announce his intentions at this time triggered speculation within Labour's ranks. While he was not expected to fight the election, he was not expected to make his intentions clear until next spring.

One Scottish colleague claimed last night that he was standing down because of recent adverse publicity over his expenses - it is understood heclaimed GBP7000 from the taxpayer to live in a flat bought by his 17-year old son days before he became an MSP - but last night Labour sources denied he was standing down for any other reason but to give the party plenty of time to select another candidate.

As speculation at Westminster suggests Mr Home Robertson will be bound for the House of Lords next year, a senior Labour figure insisted he was standing down now to avoid any suggestion of a Labour Party fix. The party is expecting the vacancy to attract interest from more than a handful of aspiring candidates. Iain Gray, a former Scottish Executive minister and now special adviser to Douglas Alexander, is almost certain to put his hat in the ring.

Mr Home Robertson, a favoured colleague of the late Donald Dewar, represented Westminster constituencies of Berwick and East Lothian, and later East Lothian since 1983, before electing to stand for the first Holyrood elections in 1999.

In the early years of the Scottish Parliament he was the Minister for Fisheries and Forestry, and in 2001 he took on convenership of the Holyrood Progress Group, which had responsibility for overseeing the completion of the new Parliament Building Project. He opposed calls to cap expenditure on the project.