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Thanks, lots of things to consider, went over today, and although there isn't much of either there is essentially a bathroom (working toilet and sink, no bath or shower), and kitchen, which is a few cupboards, sink, electric points for cooker and fridge, so hoping I might just sneak in as habitable. Interestingly Halifax who have my current mortgage do self build mortgages, so may be an option...
As Hefty said, you won't get a standard mortgage on that. It needs to be livable in (including Kitchen and Bathroom) before they'll cough up. You used to be able to get staged release mortgages for development - not sure if they still offer them these days - where you got an initial release then more when the place becomes habitable. Never as cheap as a standard one though.
Dependent on how happy you are with debt, you could also get a bridging loan to get it bought / done up enough then pay that back when you mortgage. Need to factor in all those costs in your planning as it's not cheap - we did it when we bought a shell flat to convert.