Am I reading this right? They are offering you £50 for a car you’re selling for £5,850? Either there is something seriously amiss with their algorithm or they know they wouldn’t be able to flog it on.
I’m with Chris - there comes a point with a Beamer where servicing it becomes a liability and the price drops off a cliff edge. Unless it’s a newer one where service intervals depend on usage not the calendar. My last one only needed serviced every 18-24 months instead of yearly. We spent MUCH more servicing our much-hated Volvo, but it held it’s value better.