Travel Insurance that covers flight cancellations?

[CONFUSED]

We are planning to go to UK, in Jan' 2010 and looking to get a travel insurance that covers flight cancellations due to weather condition i.e. snow storm etc. Please suggest an insurance company.

Thanks,
Policy

I have checked two websites -
- RoyalSundram
Coverage - Trip Delay(After 12 hrs)
- TaTa-AIG
Coverage -Trip Delay: Reimbursement of additional expenses occurred due to trip delay (only if the trip has been delayed for more than 12 hours).