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[TheBoy]

Is the AR 25/35 adaptive?

ie does it adjust the shift points according to driving style?

Another consideration for a pre facelift car is that it has  mechanical throttle control. Is it beyond the realm of possibility that it's out of adjustment...

All Omega TCM's are adaptive, but this is a first change only, so not the adaptions.  They do hang onto 1st gear a bit, but this sounds excessive.

Can't see how the throttle (or ICV) would make a difference TBH.

Might it be lifting the cold start idle speed? Possibly by way of an air leak or defective sensor? Obviously I haven't ever owned the suboptimal earlier cars, so never got that involved, although I have worked on a few...

Can't see how that would cause the symptoms the OP has with initial gear change....   ....I'm sure it it was idling at 3000rpm, the OP would have said.

[Valentin]

Indeed, the cold start rpm is around 1500 when under 5°C, and around 1100 these days. After a few seconds it settles to 500rmp and there is no air leak in the intake.

Another point is, if I go from D to 3 or 2, of course there is no change. This could confirm it's level related ?