They've republished their figures then as they were heavily criticised for trying to claim 1m as individuals.It would seem from this BBC link from last year that the Trussel Trust DO account for repeat visitors: http://www.bbc.co.uk/news/business-27032642
As I said about the increase though, taking figures from a single charity that is rapidly increasing its presence is at best going to find a correlation but is unlikely to even show that properly.