I've received an email from SP saying the transfer process is underway. Thought the tariff info might be of interest to others:
We're pleased to let you know that your transfer from Tonik Energy is now well underway and your new ScottishPower account is currently being set up. This follows the energy regulator, Ofgem, appointing us to take over your energy supply as a result of Tonik Energy ceasing trading. Please be assured you're in safe hands - ScottishPower is a well-established energy supplier with a bright future.
We've provided details of your tariff below, as well as some important information to help you get the most from ScottishPower.
Your tariff
We've put you on our Basic Energy V2 tariff - this is an exclusive tariff created specifically for former customers of Tonik Energy, and provides some of our most competitive prices. You can view all your tariff information including your prices, estimated annual costs, Tariff Information Label and key terms by clicking the link below.
It's a variable tariff, so doesn't appear to be 100% renewable. So I may switch away to another provider. Judging by the comparison sites 100% renewable electricity has gone mainstream.
EDF are marketing "100% zero carbon nuclear electricity", which I've not seen before and will be steering clear of.