Hi Conan,
I think the train is not the best option. You should contact one of the big trans-European shipping companies (DSV for example). They can find a truck that is going from around Sicily to somewhere in the UK and arrange to put your bike in it, then you can just fly home on Ryanair and pick up the bike from a cargo terminal when it arrives.
Last year I got a quote from DSV (whose local agent knew how to ship bikes and could give advice on how to prep for intra-EU truck shipment - the short version is, nail two europalettes together) for Estonia to Barcelona for around 300 euros each way.
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