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I've sent bikes before by Parcelforce, think it was about £15, plus a bit for insurance if the values over £100. If you get a box from your local Halfrauds you won't have to worry too much about any other packaging.
Any of the major couriors will pick up and deliver bikes, DHL Amtrack etc etc, just ask your local bike shop for a old box (they are usually more than willing to hand them out as if saves them getting rid of them) take the pedals off, loosen the handlebars from the stem push them under the top tube and bobs your uncle. Usually costs £25-£30.