It may be tempting to ask your man and van to refit your gas oven at your new place but if he has any sense he will refuse.If you have a leak ,or your flu is blocked or your oven is not burning properly i.e. carbon monoxide then he is in big trouble.Get advice from a corgi plumber or you landlord,or both.I personally will never reconnect someone elses oven although i see other man and vans offering this service.Ask if he is a Plumber.I doubt it.Plumbers are the laziest people in the world and don’t even like carrying a bag of tools and parts to your door,never mind a three seater sofa bed.