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Looks like the new name is intended to be official - CMJ (but not B) registered the trademark, The Fizz - https://www.ipo.gov.uk/tmcase/Results/1/UK00003196932
The application was filed on 15/11/16. I tried to post on here about it a few days ago but kept getting server 500 errors so couldn't log in. Anyway, current status as at yesterday is "application published", which apparently means "The application has been accepted and published in the Intellectual Property Office Trade Marks Journal for opposition purposes."
As others pointed out on another thread, will be interesting to see if Bobby/Heidi oppose it. As I understand it with any new trademark, it can't be too similar to an existing one if it's for the same purpose, so I think B/H have grounds to oppose.