Score the fat on top of the gammon joint.
Wrap the joint loosely in tin foil, making sure the foil doesn't touch the fat.
Cook the gammon in the air fryer at 170C for 1 hr and 10 minutes.
Mix the dijon mustard and honey, and season with salt and pepper.
Remove the ham from the air fryer and unwrap.
Smear the top of the ham with a thick layer of the glaze.
Return the ham to the air fryer uncovered for 10-15 minutes.
Check that the ham is cooked through, then leave it to cool before refrigerating and slicing.
