Roll out pastry to an 11 x 7" rectangle. Trim to give a perfect shape.
Finely chop ham and add to rest of ingrediens. Spread mixture over pastry until 1/4" of the edges. With the long side facing you, roll up like a sausage roll and then wrap in cling film. Chill for 15 mins.
Cut into slices about 1/4" wide and place on a dampened baking sheet. Bake for 8-10 minutes until puffed and golden.