we're talking about the Royal Family, for whom we pay.
About £1.25 per taxpayer per annum
Right, how much would elections for a President cost every four years over 70 years 
Plus the upkeep of a Presidency, a new palace or two, fleets of brand new limos, a Firm to keep the whole shebang on the road etc etc .........
At least £1.50 pp pa I reckon
Yes, Why Are SUV's Getting Even Bigger?
Should we be more open to a wealth tax?
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