Preheat your oven to 180°C/160°C(fan)/350°F/Gas 4.
Place 1.3 kg Ham joint in a large baking tray.
Cover the ham and baking tray with foil. Cook for 2 hours 15 minutes.
Take out of the oven and remove the foil and the majority of the fat.Using a sharp knife, score a diamond pattern in the remaining fat.
Mix together 50 g Honey and 3 tablespoon Dijon mustard and pour it over the ham.
Return to the oven, uncovered, and cook for a further 30 minutes.
Notes
They honey and mustard mixture that is left over in the baking tray is very difficult to clean off. So, my advise if you are making this at Christmas time is to use a disposable tray to save yourself some time. But, if making this regularly I wouldn't say to do that all the time because of the environmental impact.
If you want to your honey roast ham this less salty, then you can soak your ham joint in water for 2 hours and then rinse and pat dry with paper towel.
Allow the roast ham to rest for 10 minutes before slicing. This allows all the juices to redistribute through the joint and make a really juicy ham.