(Reuters) - Britain's stock markets fell for the eighth day in 10 on Wednesday, as more companies warned of a severe hit to earnings from the coronavirus outbreak even as policymakers pushed for fresh stimulus measures to support global growth.The blue-chip FTSE 100 fell 4.%, with Carnival Corp and other travel stocks such as Easyjet and InterContinental Hotels under pressure.Aerospace engineers Meggitt , Senior and Rolls-Royce dropped between 11% and 25% as evidence grew of the severe..