Hey guys, I came across a very interesting website I think you should check out http://www.ricambibeta.com.
These guys are Italian and they sell original Beta parts, so keep that in mind when checking their prices. I personally find their prices to be comparable to most of Apico or Jitsie parts I've seen so far on some UK websites.
I am fortunate to have parents living in Italy so I benefit from free shipping withing their country, but they ship abroad for around 30 euros they told me.
They are also extremely well organized and they provide you with exploded view of all your bike's parts. Unfortunately they are only specialized in Beta's....lucky me, right?