CMCR Ltd. of Larbert and The Munro Society have been carrying out surveys to check the true height of mountains, to see if any of the close contenders would turn out to qualify for Munro status after more accurate modern surveys.

They announced on 6th September that their survey of Beinn Dearg (North of Torridon) shows it falls short of the 3000 feet (914.4 metres) mark, though by less than a metre. Earlier in the year, a survey of Foinaven confirmed that it too was less than Munro height.

Beinn Dearg 189529.601 Easting, 860820.553 Northing and a height of 913.675 metres
Foinaven 231519.451 Easting; 950698.611 Northing, and a height of 911.046 metres.

The new heights have been ratified by the Ordnance Survey

This means that both confirmed as Corbetts, failing to reach the required height in excess of 914.4 metres to qualify as a Munro.

http://www.mountaineering-scotland.org.uk/news/brief_news.html#foin