Greg, thanks for the advice, good to hear I shouldn't have to replace the whole units, I'll get back on to the dealer.
CD - agreed, well that, the minidisk, alarm that wakes me at 3am and the soot regeneration issue which cost me last month
Still think it's the best car I've owned though but at 6 years with 88K on the clock, I'm wondering whether I should stick or twist.