ASHP retrofit suitability - 1960s chalet bungalow

We moved into our current house in the spring. It's a 1960s semi-detached 4 room bungalow in Cambridgeshire, brick construction and a tile roof. Sometime in 1970s the loft was converted to add two rooms in the roof. The property has an oil boiler, electric shower and a woodburning stove in the living room. Cooker is electric. EPC was done in 2011 and is E54 – and says the area is 99m2. There's cavity wall insulation and ~20 year old uPVC double glazing. The conversion

Thanks, lots of food for thought. My questions were made up as I thought of them so definitely a bit stream-of-consciousness ? A few clarifications... I've been looking at the RHI and the Green Homes Grant. We're eligible (I think) for 10K of GHG, which must be spent before end March 2021. Needless to say, all the installers are going to be very busy over the next 6 months (the GHG is a bit of a poorly thought out scheme where there's no time to train up any more staff