Fresh allegations have emerged accusing MP Ross Thomson of "unwanted touching" relating to a fellow politician.

A Scottish MP, who has not been named, has now made an official complaint to parliamentary authorities.

STV News understands the incident at Strangers' Bar at the House of Commons is said to have happened in December.

The man was with Mr Thomson and was allegedly "touched" before he joined other friends.

Mr Thomson is already being investigated by the party over complaints about his conduct in a bar.

A source close to Ross Thomson said: "Ross will fully co-operate with any parliamentary inquiry. It would be inappropriate for him to comment at this time."

In a separate incident earlier this month, officers were called to the same bar and spoke to Mr Thomson about allegations of "sexual touching".

No arrests or complaints were made at the time. Mr Thomson said the allegations were "completely false" and referred himself to the Conservative Party's disciplinary panel.

Responding to the latest allegations, Scottish Conservative interim leader Jackson Carlaw said: "I've read, like others, the reports in this morning's media.

"It clearly is now something which the standards committee within the Westminster parliament is investigating.

"I'm not a party to any of the information they have, it will all be done on a confidential basis, and obviously I hope they're able to do that timeously."