MT4 Test data

I'm doing some testing of a H1 timeframe system and would like to find a decent amount of tick by tick test data i.e. at least a couple of years worth.

Where is the best place to get this? I seem to remember some brokers actually carried this amount of history data and you could access it just by openng a demo account but I have lost the details of which broker(s) it was.

Any info on brokers or sites with free data or places to buy this data much appeciated.

By the way I should add I am mainly interested in data for cable at the moment although any other pairs would also come in handy at some stage.