New propshaft on the Vito (this is a very common failure item).
We could play "guess the price from MB" but I'll tell you ... £2,460 plus VAT = £2,952 (plus labour of course)

Or a reconditioned one instead for £1,400 plus VAT.
I went with a GSF one for £730 all-in (fitted, including VAT). Have done 300 miles on it in the last 24 hrs (nearly all motorway) and it seems absolutely fine. May not last the 164k miles the original did but it'll hopefully do for the remainder of the time we have the van.