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Simples really, you have two heat sources, one (the Air Source Heat Pump ASHP) is efficient so long as air temp above 5°C outside, so when it gets below that a simple control box based around a frost stat calls for heat from a traditional oil/gas boiler. - Just need to make sure of the hysterisis of the outside stat as you don't want the system cutting in / out every few minutes, so go for at least a 3°C temperature change before switching back to the Air Source Heat Pump - say off at 4°C and back on at 7°C.
Just remember guys anythings easy when you understand how it works but at the start of learning about anything its not always simple , just a thought eh whyme