WALES Under-20s boss Gareth Williams said his side didn't deserve to leave Scotland with a consolation bonus point after an error-strewn performance in Scotland.

The Welsh youngsters' Six Nations title hopes were ended by a 27-20 defeat at Meggetland in Edinburgh.

Two late tries by replacement hooker Will Griffiths of the Dragons and Leicester's Sam Costelow, who impressed at fly half when he came on in the second half, ensured Wales left the Scottish capital with a fortunate consolation bonus point.

They had headed north buoyed by their stunning late success against England and aiming for a win to set up a title showdown with Ireland in Colwyn Bay.

Instead their motivation is now denying the Irish a Grand Slam after they secured top spot with a win against France in Cork.

"It was really disappointing in how we executed things - we had about a 60 per cent turnover rate which is unacceptable at any level to be fair and that cost us – we couldn't get a foothold in the game," said head coach Williams.

"I thought Scotland were excellent but we prepared expecting that, they have grown through the Six Nations, but we didn't match that and deserved to be on the wrong end of the score.

"We're always asking questions of players who have opportunity, nights like this help answer questions on that as well.

"It's an ongoing process, we talk about development a lot but winning is a part of that process and that was a game which should have been much tighter but through our errors we didn't allow that to happen and Scotland were superb in capitalising on our mistakes.

"We showed great resolve to get a losing bonus point out of it because I don't think we really deserved to get anything out of it."

Scotland led 19-6 at half-time thanks to tries by Connor Boyle, Robbie McCallum and Rory McMichael with Wales only managing a pair of Cai Evans penalties.

The Scots had their bonus after 50 minutes through wing Jack Blain and Wales rallied too late to slip to fourth in the table, a point back on England and two behind the French.