Now my back is batter I'm back on the case.
This is the last thing before engine in.

So here are the 3 cambelt tensioners currently sat in front of me.

1) Old tensioner - old engine
2) Old tensioner - new engine
3) New tensioner.

Now, do I simply pop the new one on (I just cannot remember how the old one was when it came off) and do step 13 in the FAQ?
"13. Turn tensioner anti-clockwise using 8mm sump key. As you tension the belt you will see the cam pulleys rotate anti-clockwise. Keep going until you can twist the belt between inlet and roller by about 75 degrees. If you can twist it more it's too loose, if you can't twist it 45 degrees it's too tight and will cause premature failure of all components."

Do I need to go and buy an 8mm sump key?

or is that big bastid something important and updated?
It's all from the 137tooth kit

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the zombie apocalypse started long ago, only no-one realised most can talk and drive

136 timing belt numbers and whatnot for ref on my 205 gti6 engine just in case you need them:

082017 timing column
692378 tensioner securing bolt
083148 genuine 136 tooth timing belt kit

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306 rallye reproduction decals (full sets/individual decals) | 306 b-pillar textured vinyl weatherstrips
306 slam panel esso stickers | 306 yellow / orange / pension fund red side door badges
gti6 inlet manifold badges | 306 rear boot badges (p2/p3)
winner of Extraction of toys from prams with outstanding vigour award 2009 [source: gti6 owners club]