BMW has announced a round of updates for its UK range, including two new engines for the new 5 Series as well as changes to the 1, 2, 3 and 7 Series models. The first new engine is the 520i petrol, which is a 2.0-litre turbocharged engine with 183bhp and 290Nm of torque, delivering a 0-62mph time of 7.8 seconds …