This is happening sooner than I was expecting, a £40k M4, a high miler, but still not beyond normal usage:
http://usedcars.bmw.co.uk/M/3.0-s/s/Chester/4021138-605457298-3497280.aspx?srcmdc=se_na_re_
http://usedcars.bmw.co.uk/M/3.0-s/s/Chester/4021138-605457298-3497280.aspx?srcmdc=se_na_re_