Does it matter if I have an odd tyre?

A recently purchased Fiesta has continental tyres except the near side front which is a goodyear with a similar tread pattern. Is this acceptable?

Is it illegal to have mixed tread patterns on the same axle?

I have read that you can be fined by the police for having mixed tread tyres fitted on the same axle. Is this true? My local Citroen dealer replaced one of my Cross Climate Michelin tyres with a Michelin...

My car came with mixed tyre tread patterns but the dealer refuses to change them?

I bought an approved used BMW X5 that came with directional tyre treads at the front but asymmetric at the rear, all Dunlops. The BMW owner's handbook states 'incorrect tyre combinations will interfere...