i have just noticed when sat at idle speeds my near side headlight bulb vibrates but stops when revs pick up !

Bulb or whole light unit? Could be a loose or damaged mounting bracket.

The headlight sometimes comes apart inside, especially if someone has been a little brutal getting a bulb in.

The movable part of the inner headlamp unit pivots on ball studs and can pop off and become loose if you are a bit heavy handed when changing a bulb. It's very easy to pop it on again without any further dismantling if you study how it moves.

rotodiesel.

The movable part of the inner headlamp unit pivots on ball studs and can pop off and become loose if you are a bit heavy handed when changing a bulb. It's very easy to pop it on again without any further dismantling if you study how it moves.

rotodiesel.

For once we can 100% agree on something

As above the fixed pivot does have a tendancy to pop off when it's left the factory at Skoda or it could be a loose fixing point to the bodywork............

there the hid factory unit so the bulbs have never been touched

there the hid factory unit so the bulbs have never been touched

Does it look like the module (bullseye) is sat square in the bezel?

there the hid factory unit so the bulbs have never been touched

Could've been touched a tad too hard in the factory when fitting the HID inserts

More seriously, I managed to do pop one mount off when I was playing with headlights on my Octavia - also OEM HIDs.

Could've been touched a tad too hard in the factory when fitting the HID inserts

More seriously, I managed to do pop one mount off when I was playing with headlights on my Octavia - also OEM HIDs.

I had my lamps delivered from one of our factories in the Czech Republic and they both arrived with the module's popped off the fixed pivot.............pushed them back on with a tool that they then sent to me the following week!!

The reason why you pop off the mounting when replacing the bulb is because your supposed to re-fit the bulbs with the lamps out of the car............