Actually BigPinkLad they didn't go decimal they went centigesimal. And that was 'cos at that time someone wanted the other one hundred and forty pennies out of the pound.
They got those pennies fairly quickly and set the stage for rampant inflation.
When they started f^%#ing with the coinage the price of a pint was less than five bob. Now I hope those who think that they got PROGRESS are happy paying one pound and ninetytwo pees for their beer.