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Cameron declines to sink the Black Stuff

British Prime Minister David Cameron became the second dignitary in as many days to decline to turn down a free pint of Guinness.

He paid a visit to the James’ Gate brewery with Taoiseach Enda Kenny earlier today, and was shown the brewing process by Operations Manager Colin O’Brien.

However, a special six pack of Guinness that was brewed when the Prime Minister was on the premises will likely be sent for him to sample at home in Downing Street.

"It's a standard Guinness brew, but we will make sure the Taoiseach and the Prime Minister get some of that to taste, so they can have the beer that they launched," Mr O'Brien said.

Mr Cameron - on his first official trip to Ireland since taking power - toured the St James' Gate brewery, which is the country’s number one visitor attraction.

The Queen and Duke of Edinburgh also visited the site yesterday and were instructed on pouring the perfect pint at the Gravity Bar.

And although the British prime minister did not have a pint, he did slip into philosophical form when it was revealed that only a small number of people know Guinness' secret ingredient.

"You always want to know where the real power lies," quipped Mr Cameron to the Taoiseach."This is one of those moments you realise it's not with you."

A master brewer from Guinness has already travelled to Moneygall in Co Offaly with a special keg to be poured for President Obama next Monday.