Thanks for all the replies!
Having read the first few posts yesterday, I decided to give the lad a chance.
Figured I'd tell the boss more about his good points (working) and less about his conversational carpet-bombing.
Figured he'd settle down in abit and end up an asset to the company....
Fat chance of that!
Boss wandered through the warehouse at lunchtime and found new lad stuffing around £130 worth of MP3 players (ours) into his pockets!
Fired him on the spot.
Boss said afterwards that he had nothing to say for himself!