I think if you telephone your local Checking Service they will tell you the latest regulation.
When I was a Civil Servant and used to sign all kinds of papers we were always advised (not instructed) to inform the person that they must then use our sign within 6 months. I really don't know what the current advise is, I can't imagine it changed but you just never know.
BTW we used the local checking service and although you pay for it, we found they did an excellent service, with loads of advice and useful info. Very well worth the extra money.
I would very strongly support the suggestion of Joe bloggs. Brilliant, but you pay. It's a very fair price though.
