I am currently building a complex model that evaluates trading potential based on statisical movement in the FOREX market. I am having a very difficult time with finding good 5 minute data for the GBP/USD that goes back for a full year or more. I subscribe to esignal, but they will only go back for six months. I found an outfit in Russia that will give me whatever I need on any stock, commodity or currency, but the data isn't reliable.
Does anyone know where to find good data that is audited and will go back as much as a year on a 5 minute basis? I need to know the open, high, low, close prices.