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@Olly398
Don't mean to start a fight but you forgot to mention that a heating flow temp of <40 degrees C is required to get decent efficiency out of air source heat pumps. So even if it fits under the stairs, you really need to be using it with a wet underfloor heating system to make it work as intended.
Also, whilst I'm not arguing with your maths, for completeness you should also remind the reader that electricity costs about 3x as much as gas and incurs 2.5x more CO2 emissions (unless is comes from a convenient renewable source, which most people do not have).
So it may save some money and CO2, when it's all worked through, but may not be suitable for the building in question. BTW I'm not a NIMBY or anti-renewables, quite the opposite in fact. But I do get called upon regularly to advise impartially on this stuff. Good luck with your venture Nahguavkire, we need more people like you and hopefully the incentives you mentioned will be good for business!