I've finished it this evening, wow what a feeling, it's actually done
I used a couple of 1.5 inch thick pieces of oak, which were cut to size, and later planed level with the benchtop, for the back jaw I made it from one solid piece and chiselled out the waste and made holes for the m6 screw heads, I used brass screws to attach it to the apron which looked so much better, plus it won't mess up the oak and contrasts with the dark green well.
I planed the oak jaws by hand using a no4, then finished with a card scraper, with de-waxed shellac as a sealer, not sure what to do with them for the final finish, or whether I will be putting leather on them or not.
All I need to do is put a final layer of varnish on the bench top to help hide where I planed a bit of it when planing the jaws flush, I think it needs one final 3rd layer of varnish.
I have learnt so much and feel a lot more confident now, perhaps the only thing I would change is taking more time when cutting the tenons for the legs, a couple of them were a bit out of square which created a slight gap. What surprised me the most was how much time it took and also how little money it cost me, as time goes on and I use the bench I will consider making a couple of dogs, and definitely some drawers for storage at the ends.
It's going to take quite a while to get used to the idea that I actually have my own workbench.
I have to say thankyou to all of you who followed this thread, this is genuinely one of the best and most enjoyable projects I've ever done!