This is a good find; The University of Liverpool mountain database.

Storing information about more than 2600 hills and mountains in Great Britain and Ireland.

The mountains have been classified according to height and minimum reascent from all other mountains. The classes currently available are Munros and Munro Tops, Corbetts, Donalds, Grahams, Marilyns, Murdos., Nuttalls, Welsh Hills and English Hills.

The mountains can be searched by country and by region or by class of mountain.