Erm... If its more like a rattle or clattering noise at start up then there's sommat wrong with the drive chain. I took my car in for that fixing under warranty just last week. It has sommat to do with the oil not going in properly. It didn't always happen, but when it did - it sounded nasty. Luckily it happened when the mechanic tested it, otherwise it'd been one of those "can't hear owt, so can't diagnose and fix it" scenarios...
Mine's the 1.4TSI btw