Anyone have any diagrams?
Not me
What kind of headend kit do they use?
Couldnt tell you
Are they still delivering Analogue AND Digital down to customers houses?
Yes they are but we are trying to get people onto digital boxes
Is there a central "feed" to all headends for channels coming from say Sky?
I believe there are individual feeds to each franchise, so im lead to believe
Is there a local feed from Local stations to your local headend?
I dont know
How do they obtain the SKY and Terrestrial Channels from? ie dish or fibre?
Dish so im informed
Do they fibre the headend output to ALL local street cabs or just some?
Ive yet to explore this side of things
What speed is their green cab fibre network? STM-1 / STM-4 / STM-16 ?
As above.
Are all green cabs the same or are some 'master' ones?
There are main cabs for areas known as DP's.
How many households can a green cab supply before its "overloaded".
Not sure.
Is there a distance limit on the length of coax from the Green Box?
Answered by previous poter
How do they get the right signal levels in everyones house ie near and far houses?
Again, different taps give out different signals
What frequency range are we talking about in a cable network?
It depends.
Ok i'll stop there!!! All valid questions though! Sorry but I just like knowing how stuff works so any information greatly appreciated

Thats ok. An easy way to explain it, imagine a huge computer network,
Router -> Cable -> Router -> Cable-> Router...
you get the idea.