[***Mr D***]

The gas is the responsability of transco I think. so it woud be upto them to come and sort a gas leak.

However a boiler is the owners responsability, British Gas will charge you a 'one off fee' or you can take out seperate cover with them to help when this happens.

Just as a though, My boiler once wouldnt work, all it needed was turning completely off (no power to it at all) and back on. Worth a try.