UPDATE: My DVD arrived from Amazon UK, and it is actually NTSC 0, not PAL region 2.
It will not play in either of my two DVD players (both models are older), but the disc plays just fine in both computers that I tried.
Also, at the current price of 3.99 pounds, this has got to be one of the bargains of the year !!

[ price comes out to around ten bucks shipped to US: it is 3.33 pounds after VAT deduction, and shipping 3.08 pounds. YMMV ]