The mapping details and sat nav co-ordinates for Trevose Head lighthouse near Padstow are given below:
Grid reference: Ordnance Survey Landranger series LR SW850765
Latitude/longitude: 50.549442N and 5.035228W
Post code: PL28 8SH (for sat nav purposes)
Click the link for more information, including images and a map, on all the Lighthouses in Cornwall.