Thanks for those they're all useful.
It was the
Field
Elevation and
Nautical
Height one that I had seen before (but forgotten). However I really like the "For 'ere" and "Not Here"
Tinny, it's bad enough trying to get the studes to fly a circuit at 1000ft agl let alone get them to think about the airfiled elevation as well...... now where did I put my spare mental capacity?
Cheers all