[Pupbelly]

From memory there's something to do with the fuel rail or fuel pressure regulator that can make a clicking sound which can be mistaken for valve clatter. This is apparently quite normal so if this is the case then you should be ok.

Its normal that a video will pick up on higher pitch noises more than the human ear so it will sound "worse" than normal. Sometimes its down to the device you are listening to it on too. A mobile will again accentuate the high tones rather than low. Maybe listen to it through a decent speaker or radio if possible, it might not sound so bad.

The noise at the end of the clip as the camera pivots around sounds like there is a moped or something driving off in the background, so I wouldn't worry about that.