The investigation was prompted to look into Basildon Hospital after two consecutive years of higher than expected deaths. According to NHS statistics, which also take into account patients who died within 30 days of being discharged:
Between July 2010 and June 2011 there were 263 more deaths than the 1658 expected.
Between July 2011 and June 2012 there were 244 more than the projected 1699.
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Alfie Lamb was allegedly crushed when his mother's boyfriend twice moved his seat back while he was in the footwell behind.
Here is a list of branches affected in London and the Home Counties.
Police were called to Unity Close in Lambeth on Tuesday night.