LONDON (Reuters) - UK shares exposed to the domestic economy surged on Friday after Prime Minister Boris Johnson's Conservative Party won a solid majority, assuring markets that Britain is likely to be heading for an orderly exit from the European Union.The export-heavy FTSE 100 index rose 1.8% as a rally in utilities, retailers, housebuilders and banking stocks offset the drag from sterling, which surged to 19-month high versus the dollar.Housebuilders soared 10% with Taylor Wimpey , Persimmon..