my new flat

i had bulb at my last house , i have just moved to a flat , i switched online but bulb contacted me to say the supplier has stopped the switch , is it the supplier of the current owners? i clicked on the link to see what supplier but there was no result

previous owners i meant

Energy companies do not supply people, they supply properties.

It might sound pedantic, but there’s no such thing as the supplier of the previous owners. There’s the current supplier of the property, that the previous owners were using, and they will continue to supply the property until someone requests otherwise. You need to contact whoever is the current supplier of the property. If you can’t find that information from your rental agreement, perhaps you can find out here: