I spent ages trying to research an answer to your question when you first posted it (back in March). None of the usual web searches worked then and, having spent 20 minutes on the problem again, I still can't find an answer.
At this point I'd normally suggest asking the agency behind the ad but Rocket 7, which created the ad, has now been sold to Swedish-owned LeoVegas (who also own 21.co.uk) and re-branded as Rocket X. They don't seem to have a website or any contact details.
So, as I see it, your only chance of finding out who the actor is, would be to ask the director who actually made the ad. He's Richard Coulson, from the production company 're:production'. You can contact him via this email address:
[email protected]