Just searching the internet
I buy most of my tea from China - several sources including Ebay Dragon Tea House, Jing Tea Shop, Yunnan Sourcing amongst others, though I get my Dan Cong from California (Tea Habitat). I am always on the lookout for British and European suppliers.
I get a fair amount of tea from 3 British suppliers.
Wan Ling UK
Essence Of Tea.
I visit my girlfriend in Malaysia every year and bring tea back, and she comes to UK once each year, when I have to introduce her to different European countries. Italy is on our to do list, so If whilst on holiday, I could visit a tea shop. maybe this would be a good one!