Anyway, here's something:
1979-1986: Margret Thatcher (Conservative)
def. 1979: James Callaghan (Labour), David Steel (Liberal)
def. 1983: Michael Foot (Labour), David Steel/Roy Jenkins (Liberal/Social Democratic Alliance)
1986-1989: Cecil Parkinson (Conservative)
def. 1988 (Social Democratic Supply and Confidence): Neil Kinnock (Labour), David Steel/David Owen (Liberal/Social Democratic Alliance)
1989-1992: Neil Kinnock (Labour)
def. 1989: Cecil Parkinson (Conservative), David Steel/Lord Hillhead (Liberal/'anti-Government' Social Democratic Alliance), David Owen ('pro-Government' Social Democratic)
1992-1994: Gerald Kaufman (Labour)
1994-199?: Roy Major (Conservative)
def. 1994 (Social Democratic Coalition): Gerald Kaufman (Labour), Alex Carlile (Liberal Democrats), John Cartwright (Social Democratic)
Basically, Parkinson never 'dips his wick', and as a result Thatcher steps down in 1986, thinking that he's 'ready' for the top job. He makes a bit of a pigs ear of the next couple of years and a minor recession emerged just as he has to call an election, although the advantageous position the Tories are in by the late 80's lets them hold on as the largest party, though without a majority. Owen breaks with Steel and offers Social Democratic supply and Confidence to Parkinson, resulting immediately in a split between the 'pro-Government' and 'anti-Government' factions of the SDP. Supply and Confidence lasts as long as there are Social Democrats willing to keep it going, and within a few months Parkinson is forced to go to the country once more in a bitter January election, decisively trumped by Kinnock. Kinnock has a decent few years, fairly middle of the road, but is hit by a sever economic crash in 1992, and as a result steps down. John Smith, political poison as the crash happened on his watch, is unable to run, and resultantly former Foreign Secretary Gerald Kaufman steps up, positioning himself as an alternative to the 'Red Tory' Prescott. Kaufman is Kaufman, and as a result a bright young man who made a deal with his more powerful colleagues walks though the door of Number 10 (with some help) on the promise of fiscal responsibility and a morally respectable Government...