Scottish Secretary David Mundell has insisted the Conservatives can overtake Labour to become the second party at Holyrood.

Mr Mundell said Scottish party leader Ruth Davidson was already the "de facto" opposition leader and had the "capacity and ability" to steer the party into second place.

He told journalists at a briefing in Edinburgh that regional votes would be the key to Scottish Conservative success in May.

Mr Mundell said: "I've seen for myself that Ruth is the real leader of the opposition in the Holyrood parliament and now she has the opportunity at these elections to become the official leader of the opposition, and I'm confident that we can achieve that objective in the elections ahead."

He added: "I think it's a great opportunity for us and I think that we want to focus all our efforts onto achieving that objective, maximising our support and our share of the vote.

"We're just very, very focused on maximising our regional success across Scotland and getting the biggest group of Conservative MSPs ever in the Scottish Parliament.

"Ruth has shown that she is the de facto leader of the opposition at Holyrood, I want to see her as the official leader of the opposition at Holyrood.

"I think that would be the best outcome for Scotland, even for people who support the SNP and want Nicola Sturgeon to continue as First Minister, they don't want her not to be held to account, they don't want nobody in the Parliament to be able to go toe to toe with her on the big issues of the moment.

"Ruth has shown that she has got the capacity and ability to do that. I think the public in Scotland see that and I think they will demonstrate that in the ballot box."

A Scottish Labour spokesman said: "The Tories have been promising a great Scottish revival since 1997 and it never appears.

"No matter how many clever photo ops they attempt, people know Ruth Davidson is just another Tory like Cameron and Osborne."