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Sol Campbell, a wardrobe of a man, glides into one of the meeting rooms in Dublin's Westbury Hotel, cheerful and chilled.

He's over for Heineken 0.0's 'To The Sports That Bring Us Together' campaign, and will soon nip down to the River Bar beside O'Connell Bridge to watch Arsenal take on Real Madrid with a room full of Gunners supporters.

Campbell takes up someone's offer of a cappuccino. He's a little concerned that a boisterous Bernabeu might rattle Mikel Arteta's Arsenal, but those worries will melt away a few hours later when his old club outfights and outclasses the Spaniards to reach the Champions League semi-finals.

Arsenal might yet atone for the 2006 decider which they lost to Barcelona; when Jens Lehmann saw red and Campbell put the ten men ahead, only for Samuel Eto'o and Juliano Belletti to shatter their dreams.

Regrets? He's had a few, but they sit lightly on Campbell's broad shoulders.

This is a man who signed a lucrative five-year deal with League Two Notts County in 2010 and then asked to have his contract cancelled having played just one game.

In his 2014 biography, Campbell accused the English FA of being "institutionally racist", writing: "I believe if I was white I would've been England captain for more than 10 years."

Back in 2015, he declared his intention to run for the Mayor of London as a Conservative Party representative (he failed to make the shortlist).

Sol Campbell is nothing if not interesting and as he relaxes into the conversation, he offers a glimpse into a psyche that's made him such an intriguing, and at times divisive, figure.

"There's a lot of players who've played for their countries who feel more comfortable outside of their country. It's not unique to me," he says when asked about an