I don't know if they do still exist but it sounds like a very good deal to me.
Great Circle Mapper tells me that the route is 5,456 miles, thus 10,912 for the trip. As far as my old school maths goes, that is £0.0678 (rounded up to) 7 pence per mile. My 1,800cc car costs more than that to run (all costs including depreciation, maintenance, road tax and fuel). Of course I might be wrong, school was a long time ago but, if not I'd rush out and buy the ticket tight away.
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"I tell you, we are here on Earth to fart around, and don't let anybody tell you any different."
Kurt Vonnegut, Jr.