Those putting on their walking boots
and working their way through the Corbett tick list in Scotland have had a dose of double trouble removed.
Past surveyors have been unable to find any difference between the heights of the peaks Sgurr a' Bhac Chaolais and Buidhe Bheinn in Kintail, which are two miles apart.
As there is less than the requisite 150 ft of re-ascent between them, it means they cannot be considered separate mountains on the scale and thus the pair are listed as a double-Corbett.
However, a new survey using advanced GPS
measuring equipment by Welsh amateur hill sleuths John Barnard and Graham Jackson has discovered that Buidhe Bheinn is 29 centimetres higher at 885.5 ft (2,905 ft).
It is not the first time the work of the Welshmen, along with colleague Myddryn Philips, has altered the make-up of the Corbett List.
Their surveys of peaks around the 3,000 mark has added two new peaks previously classed as Munros, with Sgurr nan Ceannaichean and Beinn a' Chleibh revealed to be 2,997 ft and 2,999 ft respectively.
It means there are now 282 Munros and 221 Corbetts.