Figures from Legal & General have revealed a large rise in the market share of such deals, which made up 43 per cent of the total in the fourth quarter of 2009.
This was in comparison with 17 per cent in the previous three months.
Director of housing at Legal & General Stephen Smith said: "There has been a distinct shift towards tracker rates, most likely because fixed rates are looking relatively expensive and because fears of imminent base rate rises are receding."
However, he noted, fixed-rate deals have started to fall in recent weeks, which may change the picture when the next set of quarterly figures emerge.
Last week, head of