Despite the fact that I am in the USA, I have two Contours and an Airstream II among the cleaners in my collection, and am familiar with the part that you're looking for!  While I personally don't have any spares of this part that I can let you have, I do know that it is still available from eSpares for £10.99.  I've included a link to the item on their website, in case you're interested.  Hope this information helps!

--Bill W.