Just some closure on this matter.
After the case was escalated to the Customer Care Manager, Omega agreed to replace the dial, hands, etc. free of charge. Realistically, they didn’t have much of a choice - when I sent the watch in (and when they received it), the lume was still intact. It only started falling out while the watch was in their possession, so returning it in worse condition was never an option.
The last email from the service manager was borderline threatening - “pay now or we send it back as is”, but again, they couldn’t actually do that given the condition it arrived in.
The CCM apologised and confirmed that, considering the history of repeated water‑ingress issues, the dial should have been replaced during the earlier warranty work and it was their oversight that it wasn’t. On that basis, they are replacing the dial and hands free of charge as if it were still under warranty.
The remaining cost for me is £450 (50% discount) for the full service - new crown, stem, all tubes, pushers, seals and a full movement service. Honestly, that is about what I expected to pay anyway, so I’m fine with that part.
I also asked for a complimentary polish of the case and bracelet (normally £200+£200). Given the watch has been with them for over three months and handled multiple times, the last thing anyone wants is a fresh argument about new scratches. They initially suggested saving the complimentary polish for later to preserve material, but since I’m likely to move the watch on sooner rather than later, I asked for it now.
So overall, I’m actually quite happy with the outcome. I still have zero trust in the water resistance of this particular watch, but a free new dial and hands, free polish and a 50% discounted service (including 2 years warranty) feels like a fair resolution. Sad they didn't arrived to this offer right away, but better late than never, I guess.
One more interesting detail I only discovered at the end... because the last warranty service was in January 2024, Omega effectively “stacked” the warranties. The original 5‑year sales warranty (mid‑June 2020 purchase) would normally expire July 2025, but because the January 2024 warranty service added another 2 years - the service warranty only expired in February 2026. The watch failed again on 14 February 2026, literally two weeks after the extended warranty expired, not 6-7 months as I originally thought.
Also, the e-mail to use for UK Omega Customers is
[email protected] (this is public information), rather than
[email protected], but it is not clear on their website, as it appears out of context.
Thanks to everyone who offered advice - it definitely helped steer this in the right direction.