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Soul
I'm expecting a SCoP for the year of near 5, based on the stats so far.
Comparison with gas boiler running costs: if you take the average condensing boiler, which rarely actually runs at condensing temps, you get an efficiency of maybe 80%, meaning a heat pump with a SCoP of 4.8 is six times more efficient in this scenario.
If you run this heat pump using a tariff such as OVO's ASHP one which gives you all ASHP use at 15p/kWh, divide that by 4.8, you get an effective heat pump running cost of 3.15p/kWh of useful energy produced, relative to a gas boiler in the same house which would cost 6.25p/kWh of useful energy produced on a cheap Octopus Tracker tariff. So, ASHP in this case would be half the cost of a gas boiler to run in an identical house.