FORMER World War Two pilots and navigators are holding a signature session to mark 70 years of a Hatfield fighter plane this weekend.

The de Havilland Heritage Centre is marking seven decades since the development of the DH98 Mosquito by inviting residents to their Salisbury Hall base, in London Colney, to meet up to 20 of the heroes of World War Two, who flew/navigated the Mosquito.

The sessions run on both Saturday and Sunday from 10.30am to 1pm and 2pm to 3pm.