Westminster's parliamentary standards commissioner will not investigate the expenses of two SNP MPs.

Commissioner Kathryn Hudson was asked to investigate Angus MacNeill and Stewart Hosie by the Scottish Conservative deputy leader Jackson Carlaw.

It was reported the MPs had claimed for accommodation in London on the public purse while conducting separate affairs with a political journalist.

The commissioner has judged there is no significant evidence the rules were broken by the pair.

The SNP said the move to write to the commissioner by Carlaw was a "political stunt".

A party spokesman said: "It was a political stunt and a hypocritical move given the long and proven history of Tory MPs abusing the expenses system, as well as the current police investigations into the Tory party for election fraud.

"Jackson Carlaw would do better to ensure his own party is acting in line with parliamentary rules rather than playing politics with people's private lives."

The Scottish Conservatives said they "respect the decision" not to investigate the matter.

A spokesman for the party said: "We respect the decision of the standards commissioner.

"Our view is it is right to question such cases to ensure that public funds are always used in support of parliamentary duties."

The Westminster expenses watchdog the Independent Parliamentary Standards Authority (IPSA) is yet to declare if it will investigate the MPs following a similar complaint by a Labour MP.

Since the affair was made public Stewart Hosie has announced his intention to stand down as SNP deputy leader at the party's Autumn conference.