I am Indian citizen

Came to US: Sept 2013

US Visa Type: H4 (My husband has valid H1B and i797 valid till Sept 2015)

US Visa Validity: Sept 2015

In Nov 2014, I am planning to travel to India via London airport through Virgin Atlantic airline. I have to visit London only because my flight US->Londing->Bombay (Same airlines and checked baggage will be delivered directly to Mumbai Airport india.

I checked on UK gov website regarding Transit Visa and wording is totally confusing and nobody understand what they say.

Can anybody say YES/NO whether i need UK Transit Visa? My US visa is valid till 2015 and I am an Indian citizen. Travelling in Nov 2014.

Any prompt help is much appreciated.