Thanks Syph007, that answers my question perfectly and given your reputation on the forum I know the info is first hand.
zrxoa1, I agree the video isn't the best but I can't find any better ones and as for wanting to disable the blade lock that has to do with UK law.
Under UK law lockblades are legal to own but not to carry in public without a good reason and as the knife otherwise meets the legal restrictions and would be a very simple mod it would be easy to get a heavy duty SAK.