//I would start by following up pensions being paid overseas to those who are now dead but whose relatives continue to benefit.//
I think that Mr Sunak, having some knowledge of how these things work considering his "background", is concerned at the numbers of pension/benefits claims being processed that are liable to be either bogus or indeed multi applications for the same individual. It has been difficult to isolate these claims, for fear of it being called racism, using traditional methods. i.e. prove you are, who you say you are, sort of questions. To show even handedness therefor all claimants who live wholly or partly outside the UK will be scrutinised.