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Tonts
It's a combination of several things... the gas being pricey, the radiators being slower to feel warm (due to single-glaze sash radiating enough cold in to almost neuter the radiators when it does get really cold), the radiators therefore being on for a very long time and increasing the cost on the boiler.
I have yesterday's Nest usage showing 90 minutes, and my Bulb accounts shows about an extra £1 of usage (and my hot water use was consistent and I've not other gas use except for the radiators).
I used this for the electricity cost calculator: https://www.rapidtables.com/calc/electric/energy-cost-calculator.html
And stabbed in the energy of a Duux Stream Cool & Hot https://duux.com/en/product/stream/ which is 1500 watt on peak, 500 on lower output, and has a thermostat based on wherever you put the remote so it can turn off automatically. But I based the calculation on it being on full blast for 1 hour.
Which popper out a cost of 19.2p.
To be clear... an air fan heater you run more than radiators, it makes you feel warm but it's not as efficient at heating large spaces. But for the rooms I occupy during the day and then evening, it's going to be a lot cheaper overall if I just run this and feel warm in those rooms.
And if you do want to buy a Duux, they're hard to find in the UK but the online Fenwick store has them.