Maplin version of this in the sale. 120 down to 80. Images can be stored to an SD card Click me I've sent in a question asking the camera diameter to confirm it will go through a spark plug hole.
Reply today: The maximum head diameter is 19mm. Don't have a plug to hand to check (8v and 16v are different sizes?) but it seems too big to go down a spark plug hole.
You can borrow my Aldi one any time Steve The camera needs to be about 10mm to go down a plug hole. Most VW plug threads are 14mm I think, but the hole is smaller due to the threads intruding into that 14mm. Tried the little mirror with mine to look back up at the head, but it needs ground down a little to go in the plughole.