Fortunately they were happy to follow my advice as I advised them of the potential dangers. It was actually owned by a church who used it for worship on Sundays and as a sports centre/conference centre in the week.
I also closed the place down at a later date as well. I walked into the place first thing one morning and it reeked of gas. I opened all the doors and evacuated the staff. I went to the meter room to shut off the gas and as I opened the door it stank. I shut off the gate valve on the 6" incoming main and could see that the cover over the dials on the meter looked distorted. I sprayed around it with leak detection fluid and it was bubbling like mad. I rang Transco and the chap arrived about twenty minutes later, took one look at the meter and rang his boss. The meter was about 4 foot cubed. The commercial guys turned up about two hours later, looked at the meter, agreed with my diagnosis and then the fun started. The only replacement meter in the country was in Scotland and it took until the following morning to get it to site. I then had to get a commercial guy in to re commission all of the radiant tube heaters.
I've got a good track record of shutting places down.