Well, with reciprocal agreements, they knock off the same amount from your local pension, as you get from the UK, so the country you move to has a vested interest in ensuring you get as much as possible, because the more you get from the UK, the less your new country has to pay. For instance, I worked 4 years in NZ and get a pension from there that equates to A$40 a fortnight, so the Australian system knocks off $40 a fortnight from what they pay me.
However, the Australian system lets my husband and me keep our small UK pensions as they are below a certain amount. So a reciprocal agreement would not help us. Giving us the pension rises would be a huge help, and it seems unfair that our UK pensions will effectively shrink as time goes by, as we contributed to the system at quite a high cost to us and our employers.