Here are some graphs showing past general election results around Blackheath. If you’re not sure which area you’re in, you can use theyworkforyou.com to find out. It’s really easy, just enter your postcode in the “Your Representative” box.
These numbers were from http://www.election.demon.co.uk/1997LB.html which seems to be the only place to find this sort of info?! Note that these graphs only show the top 3 parties in each year, and show the number of votes, not percentages of votes. Also note that these numbers are for General Elections (MPs) not local elections (councillors).