Can't think of any big UK businesses that would have the ballz to implement BTC. There's very little innovation in UK PLC, that's why we have all these big US companies like Google and Amazon coming in and filling the gap. Seriously I will poke myself in the eye with a sharp object if Asda are the first to implement Bitcoin 
As much as that would suck balls, it would be a be grand FU to my sada work colleagues who think I'm crazy when I talk about my increasing bitcoin wealth lol.