Actually a full decade; it says she was a British Air Force nurse from 1934-6, in the Special Air Service from '36-'40, and in the Strategic Scientific Reserve from '40 onward. Still, we are dealing with an alternate history here, a version of the Marvel Universe rather than the real universe. It has blatant and intentional discrepancies like the existence of Captain America as a well-known war hero and the role of HYDRA as a major part of the Nazi war machine, so there could easily be other discrepancies as well. Well, yes and no. It's "020-7946 03560," which would work as a London number if you dropped the last 0 and wrote it as "(020) 7946 0356" instead. However, the file says Peggy lives in Winchester, whose phone numbers would use the dialling code "(01962)" followed by a 5- or 6-digit number.