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I've disabled wifi, no difference.
Tech at EE state the APN will have no effect on standard txts.
Finally sorted the issue.
There appears to be a known issue with the default messenger app and lollipop where it gets confused with which APN to use when sending MMS.
Solution 1 is to use a different messenger app. (No thanks)
Solution 2 is to delete all non EE APNs so that you only have:
EE Internet and EE MMS.
Wait for your phone to reconnect (a minute or so) and all is well.