UK Immigration Law
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If your original working visa expired on 4 August 2006 and after your employer filed the application for extension on 28 August 2006 your working permit was valid from 9 October 2006 then I'm afraid that you were technically here illegally.
For the purposes of your ILR application the period when you were illegal will be discounted, it is also unlikely that they will allow the two year period before the illegal period because the gap interrupt your 'continuous period of employment'. You never know, you might be lucky and they'll miss it and be okay.
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