we're still monitoring radioactive caesium contamination in the UK

No effect apart from those 350+ UK farms *still* being monitored and subject to livestock movement and sales controls. 25 years on and we've not reached the 1st half life of the caesium contamination.

You can pretend those 4000 notional deaths are fiction if you want, there was a cost to saving lives that will still be being paid long after we're all dead from Chernobyl. Of course we'll never know how many really died thanks to government ordered misreporting on Russian death certificates.