Phoned Merc dealer up and got there part number for a steering idler repair kit: 202 460 03 19 then found them for £21 delivered at the following link: (labelled as steering lever repair kit)

Parts for Mercedes-Benz: Mercedes SLK 1997-2004 Steering Lever Repair Kit

Mechanic going to fit (£10) and we'll see what happens from there...not a lot probably lol