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Also note 14k£/year salary really translates to ~£1000 per month take home after tax. You mathematically can't save £1200/month if you only get £1000 paid into your bank account, minus £120 for rent, minus £160 for car, minus basic bills (say £100) and food (say £100).
However, what he says about "cramming bags of rubble and a whole staircase into his Fiesta" certainly demonstrates a entrepreneurial and DIY spirit which indeed lets you save a lot of money in the UK.