Just hacked this together for a bit of lighthearted fun...
Only copy and paste (hence the mis-match of colours). Apologies to Bombhead and Hood over on the Shipbucket site for abusing their hard work.
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There is no way that the superstructure of Vanguard has enough volume for a Sea Slug Magazine.
Maybe an alternative approach would be getting the 1945 Lions laid down (in a hypothetical post-war Britain with considerably more resources), before having work being suspended on them for several years (like the Tiger class). The emphasis on high seakeeping speed, and high armoured freeboard, might provide them with enough volume for possibly an double-end Sea Slug arrangement, although the requirement for the necessary numbers of Type 901 directors and other radars Type 972 or 974 Surface search sets will be necessary as will a Type 992 TI Set. The are a number of radar combinations for air search/ direction, including Type 960 and at least obe Type 982/983 combination, or instead use Type 277 as a heightfinder if your radar fit is more austere. Two Type 984 sets would be ideal, but impossible due to mutual interference).
Other high volume hulls include carrier conversions (including proposed designs for Light-Fleet and Illustrious conversions). Closed hangar ships may be required to protect the magazines, so any hypothetical surging Malta hulls are ruled out unless they are laid down as/or developed from 1943s Design Bii and Design C.
Of course this presupposes the use of Blue Slug as an anti-ship missile. If you want to be even more ambitious Expert (Ship-to-Ship with Low trajectory with underwater terminal phase), Yodel (Ship-to-Ship with high trajectory, for plunging fire) (Source for both- Warship 2015) or Zonal, (a ship-launched sea skimmer flying at 500 knots propelled by a ducted propellor with range of 50,000yds , before entering the sea to home at 55 knots with a range of 5000yds) would offer interesting (although given the technology available in the 40s and 50s technically unfeasible) possibilities.
Interestingly Friedman's the British Battleship mentions weapons X, (a low trajectory weapon entering the sea just short of the target) Y, (a high trajectory weapon to attack an enemy's deck) and Z (a flying torpedo, diving into the sea 5000yds short of the target) which are clearly descriptions for Expert, Yodel and Zonal.
