The Brtish Pension is not indexed for inflation for 50% of pensioners living outside the UK - especially former Commonwealth countries.
This is currently going through the European Court Of Human Rights in Strasbourg. It's likely that the decision - due this year, but delayed, will insist that the UK index everyone's pension - Of course the British goverrnment can appeal - but really they are finally up against the ropes.
Once ordered to correct this unfair practise, pansions should then be indexed from that point. Of course if your pension was frozen many years ago it will not help much. Pension rules were also changed July 2007 - only 30 years of contributions now required for a full pension. And you can pay back yeas missed to help increase your pension - best investment you could ever make.
Every dollar / pound paid back would be recouped in about 2 years.
Google "UK Pension" for a good link to find more info.