Jupiter UK equity manager Steve Davies believes investors will need to be "tactically nimble" to handle the fallout from next year's UK election.
The political risk to UK sectors ahead of election
UK election countdown: The start of a volatile year?
David Cameron appeared to have come out top in the last and most crucial of the TV leaders' debates in which he accused Labour of failing to significantly improve the country's economy.
The FTSE 100 was marginally up in early trading, by 0.06% or 3.41 points to 5,748, only a few hours before the Prime Minister Gordon Brown is expected to call a General Election for 6 May.
The Conference season ends this week with the Conservative party rallying its supporters in Manchester, after Labour and the Liberal Democrats did the same over the previous two weeks.