Many companies (and organisations) feel compelled to destroy any documents that relate to individuals as soon as possible so as not to risk infringing the Data Protection Act. For example schools now routinely destroy all files relating to past pupils (except possibly a record of their exam results) within days of them leaving school. Similarly supermarkets know that they risk hefty fines if they keep CCTV images of shoppers for more than a very short period, of perhaps a week or two (unless, of course, those images are to be used for a criminal prosecution).
So expecting files to be held for 22 years seems to be entirely unreasonable. Financial files are often held for 7 years because the tax man can normally only go back for 6 tax years (but, since the tax year and the calendar year don't coincide, 7 years is a safer rule).