My switch date is tomorrow. I’ve ran down my electric as supposed to but I have yet to receive my electric key. I’ve received my gas card already was hoping my electric key would arrive this morning as Monday I’m going away for a week can I still use my old key to top up enough while I’m away

This article may possibly answer your query : https://help.bulb.co.uk/hc/en-us/articles/360018378031-Switching-to-Bulb-on-prepay