Well, the Euro size 50 (it's actually UK size 40/M = got a little confused..) will be in the for sale section once I get a picture of it.
For those happy to buy from Germany, with just a 2 yr warranty on their Rukka rather than 5/6 years from a UK dealer, I recommend using the Make Offer function on ebay. Compared to the usual dealers in the UK, I saved over 25%. In hindsight I should have perhaps tried a lowball offer!
Might be interested in this depending on price / fit.
My Armas is a 48 and is a little "snug" so your 50 4Air might be just right?
If you don't mind letting me know if you're definitely selling I'll go and try one for size locally...