There is like a big round 'sucker' (plunger shaped thing)
where it atttaches to the tube, this has a lot of (well a fair bit of)
black 'dust' on. I can see some blue 'arcing' on the 'sucker type'
thing which the cable is attached too. this is where the niose comes
from.


That's fairly common, you need to remove the anode cap

How do I do that? Just pull it off?
Is it rubber or metal, I thought it was metal, maybe it
is rubber, (rubber sounds more sensible.

It's rubber, underneath is a metal clip that clips into a little metal pot
cast in the glass of the tube. Once you lift the edge it'll be obvious how
to remove it.


(the suction cup
thing) clean the tube well, then smear the rubber with some dielectric
grease you can get at any autoparts store. You need to discharge the
tube
first, just connect a wire to a screwdriver, and connect the other end
to
the metal ground strap around the back of the tube

I am not sure I can find an obvious ground, there is very little metal
visable.
The four corners where the tube attatches to the case seem to have wires
attatched to then, I assume these would be earth?
There is very little other metal to be seem.


The back of the tube is coated with a dark gray conductive coating, there
should be some sort of ground contact that connects to that, often there's a
metal strap around the back of the tube.