Thanks all !
I have just re-check again and now EF is showing correctly as per MMB - as is the dummy booking now all back to 747 and all as per MMB.
How strange is that ? I repeated the exercise several times over today with exactly the same results, posted on here and hey presto all OK (Doh!)
On a better note my return next week from Berlin to LCY was cancelled, auto rebooked for 5hrs later and I kept my exit row seat!