Thanks for the replies ladies. We've been to the baby osteo twice and she has cleared him so I'm confident it's not a neck issue.

Could be an ear ache, I'll definitely keep an eye on that.

Had more success feeding on that side just before he went down, had a good feed on both sides.

I'm thinking the slow let down could be a trigger... Do I express a bit before feeding to encourage the let down faster??

Oh and Sue - lol I am already starting to get a bit lopsided!!!