A Tory MP has asked the elections watchdog to investigate Nicola Sturgeon's use of a helicopter during last year's General Election.

Charles Walker has also reported Labour and Liberal Democrat to the Electoral Commission for their use of so-called battle buses.

The move comes after the SNP called for police to investigate claims that the Conservatives breached election spending rules by failing to record accommodation costs for activists.

A SNP spokesman said:“Party leader tours are not the same as bussing in activists into marginal seats. We have correctly registered our party leader transport costs as such with the Electoral Commission."