baldylocks, I suspect that as you have not used it on gas that there is air in the supply system. I do not know your van but suspect there is a gas manifold for the hob,oven and fridge under the sink somewhere. Check that the manifold switch for the fridge is on and ensure that you can get the hobs to light to prove you are getting gas to the manifold .I assume you have turned the gas knob to the gas position and not O. Hold the knob in whilst you press the igniter repeatedly. Eventually you should get the occasional pop and if all is well eventually a nice blue flame. Continue holding the knob in so the flame failure device can heat up ( 30 secs or so)and that is it.