Can anyone clarify Martin's "rule of thumb"?

Cehl

For which he says that a fixed deal within 15-20% of new capped rates may be worth considering. I'm assuming by that he means a total cost (for both gas and elect, where dual supply) of no more that 15-20% higher than cap, as each component part (gas unit/standing, elect unit/standing) is likely to be different. Would that be a fair assumption or am I missing something obvious?

QrizB

Yes, total cost.