BRADFORD – Britain’s mainstream parties were reeling Friday after firebrand George Galloway, a fierce critic of the wars in Afghanistan and Iraq, won a sensational return to parliament.The Scottish politician becomes his Respect party’s only lawmaker after crushing his former party, Labour, in Thursday’s by-election in the ethnically mixed city of Bradford in northern England.Speaking ahead of a celebratory open-top bus tour around the constituency on Friday, Galloway dubbed his victory a “Bradford Spring,” akin to the popular uprisings that ousted regimes in Egypt and Tunisia.