Gas cut off Requirements

[Mhambi]

Is there any regulations that you need to have a gas cut-off tap for each appliance or can I run 2 appliances off one cut-off tap?
I have my gas hob and gas oven in close proximity and would like to run them off the same supply pipe with a cut-off tap at the gas bottle.
I have a main electronic cut off before it goes into the regulator and then a 3 way tap cut off block before it heads off to the appliances.

 

[Odd job]

Each appliance should have it's own isolator, but I have often seen oven and hob sharing one. If an appliance has a fault (leak) it is easier to trace if every appliance can be isolated individually