Don't forget about the Repulse, the lvl 66 remodel of the Renown.

1. As Benser says, there's the repulse remodel at level 66, which is actually a BB2. Mount the 15'' Mk III N guns, and you have bb3 range. (actually more range than Nelson)

2. Dunkerque has 1 R slot, but to compensate, it has 1 more support slot (8 vs. 7) compare to other pbbs. So you  can level same # of sailors as in other pbbs.

3. UK has the advantage of extra support slot on most ships, so grinding is easier than other nations, but you still might want to have second BO going to Revenge line. Sure, the Revenge is pretty bad in GB, but QE, KGV, and POW are all good ships to play.

Personally, I dont like QE POW line.  Pow is overpraised. You can see in the GB very few people use POW or KGV. Even there are some. If you check carefully, you will notice they dont use the "correct settings". For example, ppl use two 16*3 guns (16L and 16N) on POW instead of its 14 guns. Intead of getting into this trouble, I would recommend going Nelson which gives u more power and fun. 

the dunker is one of the best ships in the UK line ..go with it and you have range .great turning and hitting power...the disadvantage is the lack of practice with 2 sets of guns..

as you say dont class the aa gunners  so thats not an option..