As the gun carriage made its way along the Strand towards Fleet Street, applause and boos competed growing in volume.
A fight nearly broke out between one group of supporters of Lady Thatcher and demonstrators, with insults exchanged and threats made.
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The Conservative and Labour leaders are expected to use PMQs on Wednesday to push their main campaign messages.
Surrey Police has been criticised for handing back John Lowe his shotguns months before he went on to shoot his partner and her daughter.
Figures suggest that more than 11 million homes, or 42%, are in credit to their energy company.