Hi Sladey,
First of all, do you mean the MOD Survival Knife (which can be old style or new style) or the Jungle Knife (Golok No. 4).
See them both here:
http://www.sass-kit.fsbusiness.co.uk/The MOD Survival Knife is a classic, extremely tough, but it weighs a ton. Hardly anyone has a bad word to say about it apart from the weight.
The new British Army Jungle knife is more problematical. It is made by a company called Martindale in the UK.
See them here:
http://www.ralphmartindale.co.uk/ralphmartindale/europe1.htmlThe Jungle Knife is sometimes called a Golok 4, it is the new British army tool and 'replaced ' the golok 2.
The thing is loads of troops still prefer the golok 2. I think the difference may be because the golok 2 excels as a chopping tool. The balance / heft of the golok 4 seems to suit it more to being a slashing tool.
Really you need to try both and see which suits you. You could of course buy both dependent on the type of terrain you're in!
I have the extreme bonus of living not too far from the factory so I buy mine new as Martindale tools, not the military surplus ones. Interestingly, they are much less expensive as new 'farm tools' than they are as military tools.
Hope this helps.
Scott