Just finished it, made a 3 hour train journey to Newcastle today a lot more bearable! Really enjoyed Simon's interview, and I found the discussion about trilogo last 17 MOCs very interesting. I just added the cost of mine up - admittedly I don't have Yak Face yet who could cost anything from £600-£1300 these days, but on the other 16 I have spent £1997.71 so far since December 2014. So even if I did spend a grand on Yak (which I have no intention of doing) it would still be a shade under 3k.
Looking over individual prices I think most of them are still perfectly achievable with a bit of patience, so I'm amazed the average price for a set in the past year has jumped to nearly 5k. But I guess that's a lack of patience playing a big part.