Well that was somewhat stressful, but successful:
- At midnight Germany (11pm UK) same day changes were not free
- At midnight UK the interface for changing flights changed back to an older one, and flight changes became free
- But at midnight, only the 10am flight had seats in Y available
- At 6am the 4pm went from J1Y0 to J0Y0
- At 7am, the 4pm flight became Y1, which I immediately snapped up
- At 10:20am, the 1pm flight became Y1, and I managed to change to that one too.
- Now it's back to Y0, I am checked in, and even got an aisle seat.
Nothing for the faint hearted, and I can't say I slept particularly well last night.