Yet another Dour lock problem

2002 1.9Tdi estate 123k miles

Electric key fob failed to operate system a year ago and a new fob battery had no effect. Decided to abandon the electric approach and just use the key manually.

This has worked fine until now, but recently I have had to operate the key twice to lock all doors. On the first use just the drivers door locks and I have to twist the key again to lock the remaining doors. I get the usual clunks and clicks during both operations and I have to go through the same process to unlock all doors.

If I get a new key with the electrical functions do I have a chance that it might work properly using the fob, or are the odds that it will still behave as it is doing now on manual operation. My main fear is being locked out of the car and what could I do if that happened?

Is the Fabia 2 subject to the same central locking system faults as the Fabia 1?