All forms that are completed in hard-copy (not online) have to be posted back. Bearing in mind that the UK Post Office 'loses' considerable quantities of items of mail (or rather these are simply dumped into skips 'cos the staff can't be ar$ed to deliver them, that is if they don't actually steal them) - amounting to over 2 MILLION items of mail a year (or is that a month, week, day?) - then a *lot of these forms are gonna go missing.