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Not sure on all the models so you may not be able to do this on the 525, but I have a 655 which I've fiddled to do exactley that, by setting up 3 sky devices and then specifying a button as doing 1 on sky 1, 0 on sky 2 and 1 on sky 3, hey presto you're on BBC1.
It's a very laborious way of doing it, but it works for me. If you think the 525 can do this and need more help let me know.