That one would be £8540 per year in mooring fees at Tingdene marina just outside Reading. I assume since they are the seller that they would have a berth.
That's pretty expensive for Reading, would hope the facilities are excellent. I pay £12k for a 75x9 footer in Limehouse, for comparison. Looking at the map, I used to live 500m from that marina, and didn't know it was there (in fairness, 20 years ago, it might not have existed).
Crossing the Channel is easier if you lash two narrowboats together. Haven't tried it myself though. I've had neighbours get in trouble in the Thames.
@moocher - that boat is proper porn - I paid more for significantly less, but that included a central Ldn mooring.