if you mean the one where the guy's working round and the adverts about touching connecting with more people then the track is by faithless and is called sunday 8pm
....or it could be the current ad with the guy in the States who keeps saying 'hello' to everyone? If that's the one you mean then it's a track called 'Bakerloo' by King of Woolworths. The track was released last year as a single. It is also on KOWs debut album, 'Ming Star'. He's signed to Mantra Recordings.