Visitor Visa to UK, while in US on a L1B. Please help..

[Santhi]

Hi Friends,

I am in USA on a L1 Blanket Visa, which is valid till Apr 2006.
My I94, is stamped in Apr 2008.

Now, i wish to travel to the UK on a visitor visa during November 2005, for a period of 1 week.

Could somebody please tell me, what is the process involved?
More specifically, on a L1 Visa, am i allowed to travel to any other country?
And what happens to my I94 when i leave for UK ?

I would be very thankful for any other information in this regard.

Thanks,
-Santhi.