Most of these schemes aren't to LESSEN paying Tax, it's to get away with NOT paying ANY Tax on £millions£ of earnings

I'll believe Cameron is really making sure, 'we're all in this together' , when He aggresivly goes after the Tory partys main contributors' offshore Tax avoidance schemes = Lord Ashcroft

or when Osborne stops giving major Tax breaks to large companies to move their 'main offices' to the City of London, much to the ire of Germany & France. While at the same time , denouncing Ireland & the Multinationals who move there to get an even better deal (Amazon, Sky  International, Google, eBay etc)

Or when Multinationals are 'caught' , they are not allowed to employ the best People (usually ex-Tax office bigwigs) to have friendly chats with their old workmates on working out a nice little deal to make it all go away for a payment of a fraction of the Tax bill. 

or allow companies to right off £billions of Profits (by putting all your cash through Luxenburgh), so slashing your Tax bill (Vodaphone)

But of course these 'Tax crimes' pale into insignificance against the hienious crime of getting an extra £ 40 a week for sweeping  out a Pub, if your on Benefits, then the full weight of the Law, DWP and the Daily Mail will come crashing down on your head