Car makers offer cash incentive to trade in older diesels

Car makers are offering deals and incentives to lure drivers of older diesel models to ditch their cars in favour of cleaner alternatives writes Geraldine Herbert   So who is offering incentives? BMW and Mercedes have announced schemes and it is likely other car makers will do the same over the next few weeks.     What is on offer? Mercedes is offering  owners of Euro 1 to Euro 4  emissions-standard diesels, irrespective of...