Relevant parts of the UK's Copyright, Designs and Patents Act 1988:

http://www.legislation.gov.uk/ukpga/1988/48/section/50B
http://www.legislation.gov.uk/ukpga/1988/48/section/50BA

However...

http://www.legislation.gov.uk/ukpga/1988/48/section/50C

and I'd imagine BMW have a click-through license somewhere that says you won't modify or copy their stuff.