Go buy a pump

Yes you! If you ride your bike everyday then why don't you carry a pump? If you run skinny tyres then why don't you own a pump capable of pumping over 140psi?

Rant over, now I can get on with my shop duties without being interrupted

You probably don't need a pump if you run 140psi+, just stick some strips of rubber on your rims, will give the same ride