I've just bought and N810, and it came with the silly travel charger (US). I'm in the UK and want a UK type charger for the N810.

I've seen that the AC-4X charger is for the N810, but is also compatible with the N95 also. My N95 didn't come with the AC-4X, it came with an AC-5X charger.

Am I right in saying that if it charges the N95, it will work happily (And more importantly, safely) without harming the N810?

The AC-5 or AC-4 will do - at a pinch I have even managed with a AC-3, but charging is somewhat slow with that.