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£31k a year is £130/day, doesn't sound a lot to me. Trades are £250/day+ where I live. Also not clear if the £31k figure is before or after expenses and costs are taken off (van, tools, etc).
Those figures are probably true of directly employed PAYE tradesmen, but they're certainly not indicative of the self employed trades earnings, unless they're part time.
So, let me get this straight? You are thinking that a sudden rise in wages (and therefore costs to be passed on) is a good thing for the majority? It's like a rapid increase in the minimum wage means people earn more. Then all the costs go up, and nobody is any better off, but the cost of living is now higher and those costs make anything we make (not a lot) is dearer to export, and so the cycle continues. What is actually needed is longer term controlled costs (via a balance between higher and lower paid levels) to increase thevstandard of living, not the cost of living. Lower costs and therefore better exports, and a reason for us to import less and grow is what is actually needed. Brexit is based around lower priced imports, a race to the bottom.