I recently got an Apple Airport Express and have not yet got it working with my BT Home Hub. I am pretty sure that the problem is related to the security settings on the BT Home Hub since it is possible to add the Airport Express to the hub when security is disabled.
Enabling the Airport Express has been far from the usual simple enjoyable Apple experience. I had anticipated turning it on and running through a set up routine and bingo, that's it.
So far I have found these posts which seem to be possible routes to a solution but I am still working on it.
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