Other trusts with a large number of admissions include Barnet and Chase Farm, which had 756 cases in 2006/07, and Guy's and St Thomas', which had 755. The largest increase over the four- year period was at North West London Hospitals NHS trust, which registered a 188 per cent rise. No explanation is given in the parliamentary figures as to how many cases were overdoses by habitual drug users, how many were suicide attempts and how many were the result of accidental consumption.