I don't fill anything out. If I wanted to go to argos I would.
I either look numbers up on Apple iPhone (other phones can't handle it) or apple iMac or Apple Mac book pro retina display. (Windows computers might struggle due to a virus).
Or I tell the person on the till what I want and they look it up.
If they don't like it I can go to medlock opposite.
Sometimes handymen who have filled in an argos card get the hump as they have never been in a proper wholesalers and don't understand this method. I offer them a free 4 or 6 letter word if they have a problem.