Canada, Greece, NZ, Denmark, UK, Australia, have reciprocal agreements, but try to move and collect it in Canada, very hard, Spain, not sure, but you can not get both at once, you can get part of one with the other, making up one pension total, depends on how long you lived in each country, the only gain you make collecting both separately is from the exchange rate, if you take the whole pension from UK and NZ, in NZ and let the nz govt do it, the NZ govt pays you the whole new Zealand pension, and they benefit from the exchange rate, must be a million or more UK migrants live in NZ on British NZ pension