By Lars Mucklejohn Top UK bankers have warned that tough regulation and high taxes are denting investment in Britain’s financial services sector ahead of Labour’s much-anticipated Budget on 30 October. Senior executives privately sounded the alarm over potential risks to competitiveness arising from government policy and the regulatory rulebook. One leading UK banker called for “some regulatory understanding of the constraints that we are under, especially in new sectors that we can’t have quite the data, quite the statistics to forecast losses and risks”. Analysts have found a transatlantic v…