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Not sure what kind of access to large equipment you have in the UK.
Here in the US you could rent a large aircompressor and a 'jack hammer'. Not sure if you use the same name for it. They can be used to break up concrete slabs, and in smaller forms, tearing away at walls.
Procon is right, if you can get a small excavator, that would make short work of it. Just be careful.
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