The government took into account the potential economic impact on the capital in sparing London from tough Tier 3 restrictions.But the same analysis wasn't applied to Manchester and the rest of the country.That's according to furious Greater Manchester Mayor Andy Burnham who described the alleged differing approach as 'unacceptable' as MPs prepare for a key vote in Parliament today (Tuesday).Last week Boris Johnson's government announced that Greater Manchester would be placed in the toughest