The ham is simmering away nicely, though looks like shit, I'm not using Nigella's recipie which calls for black treacle (as DH doesn't like it) and found one with whole grain mustard, red wine vinegar and 150mls of maple syrup for the glaze.
Have just discovered that I've only white wine vinegar and about 15mls of maple syrup. 
I've got some fig vincotto that I've never opened that I believe us syrupy and vinegary. Can I improvise with that? 