Hi,
I have them for my car, also had (still have in the garage somewhere) a manual rear screen blind. Up to a couple of years ago they were still available from MB.
They are now discontinued I believe but still worth asking your dealer to see if theres any in stock with a dealer in the UK.
I still have one that was faulty out of the box as it did,nt roll back in properly, that "might" be repairable when I get round to it.