Hi Neil,
Just tried your last post and it fillets 0.2 on the top any bigger and it runs into a pocket.
Did exactly the same as my previous post separated the solid, untrimmed the top and side to remove neck pocket.
Re trimmed side with belly cut out and joined to form a solid, applied fillets top and bottom and to finish Boolean the neck pocket.
Hope this helps.
Barry
Ps: your body profile right side neck curve isn't smooth?