Apparently they had his mums number on record from when he first called them months ago! Somehow they got their hands back on that number rather than his mobile at first. But a minor glitch, that of course, wasn't a problem.
Haven't spoken to my cousin since the sales guy was here - but I'm sure my cousin would have been banging on my door with more tales of woe if it hadn't gone smoothly. I mean, they have actually seen the property first hand so they can hardly deny ot exists anymore
I'll be sure to post and let you know when it's all up and running.