i'm trying to record my visit here but it does not seem to have a ICAO or IATA code, but does have a AG6291 for gliding i assume, but on add a report, it will only allow for 4 letters...

Hi,

You could use X4PK as Air-Britain do.

See: https://abpic.co.uk/pictures/location/Pocklington%20xBOxX4PKxBCx

For more info see also:

http://woodair.net/UK_Airfield_Catalogue/Airfields_UK_M-S.htm

Kind regards,

Swakeleys