I just received an email from the National Trust. They are organising some 'Try Geocaching' events, at Holywell, Cornwall on 11th April.
If you can help with the 'teaching/guidance' please contact Tom at 07891688165 or 01208 863821 or by email Tom<dot>Sparkes at nationaltrust<dot>org<dot>uk.
Also, if anyone has any handsets that could be borrowed for the event, it would be greatly appreciated.