The polo has developed a smokey misfire quite suddenly 

 

This one is taken about 10 seconds after the garage was filled with smoke, oil water levels appeared to be normal

 

 

This second vid is a after a large bang trying to start, you can see the wall is black from the last few goes 

 

 

Seen anything like that before?

does it smell of fuel or oil...id be suspecting something bad 

 

compression test /check cam belt timing and report back

Comp 12 13 13 13 

hmm maybe an inj stuck open ?  had any earthing issues?

 

does it smell of petrol?

Think the smell is fuel rather than oil