I sailed Liverpool Belfast in Feb (using advance tickets), they are spending a lot of Money improving the ferries.
What was vey good is that you can board the ferry aroun 8.30pm have a beer & chips or a meal even though the ferry does not sail until c 10.30pm.
You can also book these new rail sail tickets on the Stena Website/ Rail sail, they recently emailed me, Copy of email below lots of departure points including Swindon!
"Now you can Rail & Sail on the Liverpool Belfast route.
www.stenaline.co.uk
Rail & Sail is the comfortable, affordable and stress free way to travel, offering you competitive fares.
Whats the deal?
Guaranteed inclusive rail and ferry fare
Vast choice of departure stations
City to City travel
No baggage restrictions
Attractive alternative to airline travel
Children travel at half the adult fare
One ticket, one price, and no baggage restrictions!
From £36 single
Price shown applies to Advance Adult single fares from Zone A stations Chester, Crewe and Manchester.* Advance single fares can only be purchased up to 18.00hrs the day before travel at mainline train stations and at least 7 days in advance when booking direct with Stena Line. They are subject to availability and if there is no availability a Standard Single fare will be charged. You may not break, resume or end your journey at any intermediate station except to change from/to connecting trains shown on your ticket or itinerary. Rail travel is subject to the relevant Terms and Conditions of the particular railway undertaking.* Stena Line Terms and Conditions of Business apply."