In 2014 I should have thought to check the release date of the original "I'll Never Need More Than This" singles; Feb 1967 in the US, and September 67 in the UK, so after the LP. In 1969 Spector probably thought that the track deserved to be on an album (his co-writing credit on the song most likely had a bearing), so he simply picked one of Ike's productions for the chop! And as it happens, I didn't notice the change in the production credits until you mentioned it, ppint, because I never had the London issue, only the A & M (Aussie pressing), and I wish I hadn't sold that when I got the later CD, because said CD has Tony Hall's updated liner notes printed in yellow text on white paper, and that is extremely hard to read!
philmh: that's a good question, to which i've no convincing answer; and have you noticed how the production credits on half the lp change from ike turner to phil spector on the later, '69 & ff. releases ?