So if you go to a country where your pension would be frozen again. You would revert back to your frozen pension amount. You lose the increase because you are no longer living in the UK.
Check it out but believe if you come back say every few years and spend time back in Blighty you can have it adjusted back so as it’s only £1200 I guess every 3 years as the flight will absorb any benefit.
Or as above you don’t tell them you have moved out