I think I may have fluked upon a daft workaround for my 'new' refurbished Aluminium Macbook.
Here is my drive information from system profiler for those interested:

I inserted the DVD, I got it free in the paper this morning, thought I would it in my macbook. I was initially presented with this message:

Naturally, my first thought was along this lines of "[*Profanity*], the person before me (refurbished) has changed the drive region". This would waste one of my chances, you only get 5. Then I thought, well Ill try it in VLC anyway. I pressed cancel and the DVD ejected. I reinserted it and tried VLC with the region selection dialog open anyway.
I opened the DVD using the normal method:

I was then surprised that it in fact plays perfectly fine:

I am going to try this with an NTSC dvd. I don't have one handy but I will burn one off and give it a shot. Judging by that dialog though I should have no bother.
Just realisted image sizes. Apologies in advance.