And ive abandoned the Viano....
Will get it sorted tomorrow morning...
My main concern was will i be able to undo the wheelnuts....as i know tyre fitters like to do the wheel nuts up to 200psi (so no hope of undoing them by hand usually) so i checked the tightness (Mercedes kindly provide a extendable wheel nut spanner) I could undo them no probs

Right, so get the spare wheel out......its slung underneath.....you have to turn a lever to drop it to the ground....its stuck fast, no amount of turning the lever is making it drop down.....so i phoned a mate who told me you need to kick the wheel at the same time as you turn the lever (to persuade it) and offered to be there in 5mins to give me a hand....so i turned the lever...he laid on his back kicking the wheel....spare wheel wouldnt budge

Now...my Viano was in Mercedes about 3/4 months ago having 'free of charge' recall work done on the spare wheel holder.....now its stuck

So my mate gave me a lift home.....
Think a phonecall to the Merc dealer in the morning might be in order
