What are you on about?
The agreement is a matter of record, made into law years ago.
I was responding to oxo1947 who asked if anyone knew the reason(s) for this being in place. I mentioned I didn't know the accuracy of this potential reason, but given that the purpose of these agreements is as below, it seems a valid reason, but again I don't know this, just read it somewhere in the past.
Source Hansard
https://hansard.parliament.uk/Commons/2002-05-16/debates/ca3d00e4-fa43-4893-9c6a-c72ed71a4ea7/InternationalSocialSecurityAgreements