Have I discovered a secret tariff on Bulb or what?
I would show you the images but apparently as a new user I. Cannot attach images… oh well…
Hi @whizzyuk 
and welcome to Community :wave
At Bulb we do not have multiple tariff options rather we only have one tariff depending on your meter type.
The tariff options we have are:
Pay as You Go Tariff
One-rate Pay Monthly Tariff
Two-rate Pay Monthly Tariff
EV Tariff
Here are some links to our tariffs: Tariffs | Bulb and https://help.bulb.co.uk/hc/en-us/articles/360059170212-About-Bulb-s-EV-Tariff
If you have any questions please let me know.
Best,
Luke 
Beta Smart Tariff, Till The 9th of April then the party’s over 
i better i never get that again.