A car driven by a rich chav, or a thief.
Originally they all had spoilers, but there are only four RS Turbo spoilers left in Britain. These are passed around the 1,562 RS owners frequently, when one of them forgets to garage his car - another owner promptly steals the spoiler and puts it on his car. When he forgets to garage it, the cycle is repeated.
"Oh mate, I nicked this RS Turbo last night off me mate, help me get the spoiler off?"
"'ere Sharon, fancy a shag in my RS?"
"Escort RS Turbo - no spoiler, no wheels, good condition, £50"