Too add to the confusion the grid used on Google maps does not have the same origin as the CAA charts. This caused a certain amount of confusion when we held a fly in at a farm strip recently. I gave the co ordinates from the CAA chart and posted a picture of the strip. I hadn't noticed the discrepancy until I started getting e-mails asking which co ordinates were correct.
If you haven't got a Pooleys or similar airfield gazetteer try googling
Chichester-Goodwood