Help required urgently.

The heating system on our daughters Fleetwood Bounder RV will not ignite in the living area. It worked when tried on the first day of testing everything in the RV but will not work now. No spark or gas coming through. Fan runs fine but will not ignite/fire up
Has anyone any ideas or know of a repair engineer in Yorkshire. They are looking to set off on their travels once this problem is solved so we desperatley need to get this sorted to get them off our drive

Cheers
Pete