It’s rarely the superficial finishes and the nice stuff you actually live with that cost the money. Paint & paper are cheap in the grand scheme of things; flooring & wall finishes can usually be sourced in sales etc, decent quality bathrooms can be bought online, there are plenty of budget kitchen options that look and feel just as good as high end these days. Achieving a neutral cosy country type look shouldn’t cost a fortune.
All the money will go on the labour & materials for structural, remedial and second fix stuff - every penny disappears into the unseen bits of the building right up to finished plaster. It has the potential to be stunning, but I also think that a ballpark for renovation will be £250-300K.
Which leaves you with a shortfall, OP. It wouldn’t put me off it was my dream home, but it does depend on your current family situation, your future earning prospects and your resilience and ability to live in sub-optimal conditions and a semi-building site for quite a while (which isn’t easy - ask me how I know 😂).