For once, Jack is actually right. That page doesnt even tell you the latest Government capped rates, and they are merely perpetuating the myth that Prepayment is a rip off, which it hasnt been for years.
Page 30 of this PDF tells you the latest capped rates:
https://researchbriefings.files.parliament.uk/documents/CBP-9714/CBP-9714.pdf
Based on the OFGEM average house (the calculations used to calculate the price cap) of 3000 electric units (8.22 a day) and 12000 gas units (32.88 a day) ), the costs for utilities in the Yorkshire region are as follows:
DD customers - £2.96 a day for electric, £2.66 a day for gas = £5.62 a day
Prepayment customers - £2.92 a day for electric, £2.65 a day for gas = £5.57 a day
Still want to maintain prepayment costs more?
As an aside, Electric only houses are actually better off on prepayment, once 4.5kwH are used a day (a tiny amount for an all electric house).