Originals … Mutya Buena, Siobhán Donaghy and Keisha Buchanan of Sugababes performing earlier this summer. Photograph: Ben Birchall/PA   Bristol, SWX The original three, a success at Glasto this year, performs a laser-focused set that never fails to be entertaining as they recover their close-harmonied 90s supercool reputation.   Sugababes beg the fans to chant the […]