Bike bags on trains

I've been trying to work out how to get back from John O'Groats next year after hopefully riding up from Lands End. I don't fancy being held to a certain date. Someone suggested posting a bike bag to JOG cycling to the station, packing up the bike and hopping on the train. It sounds to easy, has anyone tried it? Could it work?
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It is certainly feasible to get a bike bag that you can send in the post (that's what I've done with the Ground Effect Tardis). You could send to a hotel or you could or poste restante to a post office but they will only hold for two weeks.[/url]
Thanks for the link. Really useful.
Pete