But I think what we must do in the present climate, and this is why I think the Prime Minister was right to tackle this head on, is to try and move now to reassure people about the probity of public life, and the financing of political parties because I think that is very very important to do that.

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"There have been times when I've questioned whether I should move on and do something different but I never stopped loving tennis and I was willing to try something different which paid off for me, " she said.

BBC: Keothavong enters world's top 50