I have in the past recommended to people (who did not need the money) not to defer, and it turned out to be the correct thing to do at the time.
For each year you defer, you gain 5.8%, but you must take into account inflation here in Thailand, and also the exchange rate. Also as Bander states the freezing does not start until such time as you first make a claim. What will UK inflation be in 10 years time? How much will the state pension increase?
It is a gamble, and one that needs to be considered fully in 10 years time, or later should the goalposts be moved yet again. Then, as I have mooted several times, but not believed by some members, there is, I believe, the distinct possibility that within the next 10 years, pensions may only be payable to those that spend a minimum amount of time annually in the UK.
We never thought bereavement benefits would cease for Thai widows, but they were stopped with very little warning. That has left more than a few widows with young children with little or no money, their late British husbands having previoously been told they would receive benefits for their children. Some couples only married to ensure their wives and children would receive benefits, only to find that if they were to die now, there would be no money.
Nothing stands still, and close tabs need to be kept on everything.