The tree/shrub is about 8ft tall, next to a plum tree in Hertfordshire. It has many of these double papery sacs which contain a round fruit. It reminds me of a chinese goosberry but the paper pod is quite different.
i was looking to find out what a tree was and saw a picture of this tree, but now I can't remember which site I saw it on - not terribly helpful but it had the word Indian in it. will try and find it when have more time!