You are missing 2 sailors to make your crew a full crew. I would recommend 1 engi and 1 repairer. You were right to drop the restorer, on a BB crew they eventually amount to nothing more than poor repairers.
Your BO and Scout look fine, you can't really go wrong with them. Don't neglect your scout when you reach the Nelson just because the Nelson cannot launch Recon planes.
Your main gunners (the Reload ones) look like they could really benefit from a lot more experts, even at 120 you will need more than you have at the moment to reach both caps. But there's no need to go overkill at low levels either. If you filled them with experts though, you would probably notice quite a difference. Or your delayed Acc gunners instead if they are your future main gunners.
As for your other gunners (the delayed Acc ones), even for UK I generally recommend you class any main gunners Reload. I'm sure you can see that by delaying them as gunners you are preserving their ability to grow their Accuracy and Reload at an equal rate, however the amount of Accuracy and Reload you need is not equal, infact you need quite a lot more Reload than Accuracy (which is why the Accuracy promotion is a poor choice, due to the penality to Reload growth). You also lose out on the increased growth of manpower which comes with higher level promotions (and more men means more experts/vets, thus more ability for less weight). However, delaying them is not harming them either, boosted elites will comfortably cap both abilities eventually, but at their present rate when they do cap accuracy they will be only half way towards the reload cap.
Your level 73 and 74 Engies looks fine.
Your level 59 Engie appears to have missed his promotion to 1st Engineer by 6 levels (it's available at lvl 53).
Your level 58 Elite engie looks like he missed his promotion to 1st Engineer.
Your level 55 Engie appears to have missed his 1st Engineer promotion too.
These missed promotions just add to the repair I suppose :)
Your level 74 Repairer is fine.
Overall I would say you have one or two minor flaws but nothing to be worried over in the long term. Bear in mind as well however, there is an experience penalty for sailors too high and too low for their ships. You can see the details here (courtesy of Trainworld.us), but level ~60 supports on a Nelson will receive a -51% exp penalty for the difference in level (the penalty for sailors lower than the ship they are on is quite harsh). I recommend you stick with the Dunkerque for a while longer.