Octopus's Time of Use (ToU) tariff is capped at 35p a unit at peak time (4pm - 7pm every day). Earlier this year it sat at the max for quite a few days, but without cap I'm sure I read it would have been in excess if £1 per unit (most in the UK don't yet pay 20p a unit).
As an aside, they also now will be your FIT provider, paying you for the power you input to the grid from your home generation (usually solar). There were times when they were paying around £1 a unit but it only cost 35p a unit to buy from them at the same time. And there are quite a few people who have significant battery packs which they can charge at lower rates and feed back in at higher rates.
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