Right well in terms on import tax, its nothing to worry about especially if your buying from a nice ebayer member. All you have to remember is tell who ever your buying from to value the stereo at a maximum value of $60. And mark it a gift on the customs form. This will mean it gets through no problem. Even if you do get cought if its been marked down you'll have to pay maybe £10.
I've imported loads of parts, I used to have a Honda CRX Del Sol, and imported a CAI, my full turbo setup, coilover kits etc.... You just need someone whos nice enough to declare a cheaper value for you on the other end.
Hope this help everyone
Cheers