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What you're describing can involve a full demolition back to external walls and then hanging a thermally broken envelope from scratch (to Passivhaus standards perhaps).
But it shouldn’t, unless you are mad or the place is fucked to start with.
Carefully specc’d and fitted external, underfloor and under roof insulation with some decent windows / doors should do.
Howard
JonoMarshall
What you're describing can involve a full demolition back to external walls and then hanging a thermally broken envelope from scratch (to Passivhaus standards perhaps). Is that what you're after? If so, I'd go down the PH architect route.
If not, then the issue with Victorian retrofit is the leakiness of the envelope to begin with, this might make it impossible to benefit from a heat pump (where the flow temperature needs to be low).
For that reason I'd start with heat demand assessment and pressure test with someone who can talk you through what might be possible for your envelope within your budget? There may be an argument to put all your money into the envelope and skip the pump/PV for now...