As requested feedback on the two bits of bacon.
The bit cured with the commercial cure is less salty but has charactersitics similar to supermarket bacon (texture and taste although obviously without all the horrible watery residue) .
The bit cured with natural sea salt and mollases is saltier but is more like the flavour I was looking for (and nothing like supermarket style bacon). I used it in a tomato sauce for pasta last night and was very pleased with the flavour (although I ate about half of it out of the pan before adding the tomato as it was so delicious).
Clearly using high quality coarse sea salt and mollases is much more expensive than using the commercial cure but that, as they say, is life.
Out of interest, would it be possible to dry out the excess salt and molasses and re-use it? I'm concerned about food hygeine if I did so but it would make this a more affordable option as this last attempt ended with me having to throw away about a kilo of salt/sugar mix. To confirm, the method used was to bury the pork belly in the mixture in a box with the fluid draining off via holes in a plate on which the pork and cure was placed.
Belated editing: Both pieces had a very good "pink" colour presumably in the case of the home cured bit because of the nitrates in the sea salt. With the colour of the molasses as well the second bit was (when cut) the same sort of colour as parma ham