When I first moved in the gas supply was capped and the meter missing - as was the boiler, header tank radiators and gas fire (the house had been repossessed and either the owner or someone he owed money to had stripped it ... luckily the hot water tank was too difficult for them to get out).
I fitted a fire and enquired about getting the meter put back in and the gas connected. They turned up the next day, did the work and then did a drop test. The result was fine, despite the cap on the (temporarily) unused boiler connection sitting loosely on the pipe and not being tightened at all.
SteveW