Political geeks of a certain vintage are still nostalgic for that Portillo moment when, at 3.10am on 2 May 1997, Tory cabinet minister Michael Portillo lost his safe Enfield Southgate seat to a shocked Stephen Twigg. A ripple of applause ran through Britain as the result was read out, turning to screams of delight as people realised the moment signified an end to 18 years of Tory rule and the dawn of New Labour.