In the light of the possible flight disruptions due to ash, it's worth knowing about the 'rail & sail' offer between Belfast and Scotland. You can book a train & ferry between Belfast and Glasgow/Edinburgh for £25 each way. Separate train and ferry tickets will almost cost double.
Train to other parts of the UKwill cost a little more but again far cheaper than if you get the tickets separately.

Buy 'rail & sail' tickets at scotrail.co.uk/content/rail-sail-belfast.html
or
stenaline.co.uk/ferry/rail-and-sail/
Website will only take bookings at least seven days in advance.

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