TrigpointingUK

Someone may already have this info, but it occurs to me that it should be fairly simple to work out. You can download a gpx file of all trigs (http://trigpointing.uk/trigs/ then click 'download'), then use a service like http://www.gpsvisualizer.com/elevation to add the height data for each point ...

I really hope this question doesn't cause too much debate.
If Little Ouse is the lowest Trig Point and Ben Nevis is the highest - what would be the most average height?
Is there a consolidated list of heights of TPs?
Any help would be hugely appreciated.
Thanks in advance