A mate of mine with a mk2 jetta had 8s on it, which protruded (metal only, not tread). He got pulled for it and the police said "They need to come off, they're too dangerous. The protrusion means a pedestrian's scarf could get caught on the wheel"

Ive had similar, my old arosa only had 7"wide rims on it but the offset was something silly like -22
The had me in the back of the X5 whilst we argued that i was right (rim allowed to protude and tyre wasnt)
All whilst his mate took photos and sent them the the "experts".... Long story short the expert said i was right but i needed mudflaps andc got a £60 fine

all depends on the copper