After much procrastinating, i finally did some checks online - and found it's called "The Gherkin" (Oxford Concise Dictionary: a small variety of cucumber, or a young green cucumber, used for pickling). The official name is actually "30 St Mary Axe" - which is its address!
It is the2nd tallest building in the City Centre, after the Natwest Building nearby (tho the honours for London still belongs to the Canary Wharf Tower - see pics here) and is the home to the Swiss Re. Check out its website wif more interesting info and wonderful pics here.
Anyways, i decided to hunt for it and i found it yesterday. It was weird initially cuz when i got there, herds of people in coats were streaming out of the building. I realised later that the fire alarm was on. I never did find out if it was just a drill - altho it prolly was. Here are me pics!
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saw that from london eye (yeah i was conned by a fren) n wanted to check it out but didnt hav the time. didnt know about its nickname. so that's how the entrance looked like. thanks!