For his sake I hope not. If he did he could end up in prison if this was brought to trial (if a first tim eoffender he would probably just get a fine). Forging signatures is really bad, never do it.
Debt collectors in the UK do this as a matter of course. If you ever get one on your case, your solicitor will suggest that you print your name or write an X rather than use your signature or it'll come up on another document agreeing to piles of additional charges later on.