By Ilaria Grasso Macola Workers have given Amazon until Wednesday to present an improved pay offer after staff walked out last week over salaries, City A.M. understands. Around 450 workers at the Tilbury warehouse went on strike on Wednesday night and Thursday after Amazon responded to demands for a pay increase with a 35p per hour raise. Members of the union GMB have lobbied for a £2 per hour increase as the cost-of-living crisis continues to bite into workers’ pockets. “Amazon is one of the most profitable companies on the planet,” GMB’s regional organiser Steve Garelick said on Thursday. “W…