Do not Drink and Drive. The penalties are SEVERE, but above all it is dangerous. The alcohol limit is 35 micrograms per litre of breath
After reading all this, I really don't think I could drive in the U.K. sober. I'd have to have a pint or two in order to calm the old nerves. Seriously, all the rules and directions included on the link you furnished make sense, but you had sure better be alert if the only driving you have done has been in North America !! Bug