SOLVED!
It turns out, (after discovering that my input nipple to the slave cylinder was leaking) there is a seal. This seal, (a type of thick o ring) was still housed in the old slave cylinder that i had removed to make way for the new one. Upon looking inside the old slave cylinder there is an o ring inside, it is very difficult to make out, looks like its all one unit, but it isn't. this rubber o ring is more like a very small rubber pipe that sleeves over the very end of the slave clutch hydraulic pipe nipple that is pushed and clips into the bellhousing.
It was the absence of this seal that was not allowing for pressure in the clutch system and in turn the pedal etc. As without this o ring seal it will leak/drip the fluid and allow in air.
I was lucky I still had the old slave cyclinder to find this o ring still inside, although was s***ting myself when i thought it wasn't in there because it looks like it is not. It stays seated inside the hole more often than not on your old slave cylinder, and looks as if it is "made into" the slave cyclinder. It is not, I used a very small flat head screwdriver to pry it out from the hole it was seated in and BANG! I fitted it to the nipple, boshed it into the new slave cylinder fitted in bellhousing, plopped the clip in and result! The clutch pedal immediately worked upon bleeding.
Now the garage never told me this yesterday when i went for that pipe to try out Lord Knobrots technique into bleeding the system, even after a conversation with them about a leak in the hydraulic line into bellhousing. They even said "it was difficult for some people to try and refit that nipple into the slave cylinder... then the other chap said "yes.. maybe have to use rubber sealant". I know what they were talking about now. They were referring to the seal, that not many people know about.
Also this seal may not always be left behind in the old slave cylinder, it may pull out with the nipple or fall to the ground upon pulling the nipple away from the original slave cylinder in the bellhousing. So be careful and keep a watchful eye out for it on the end of the nipple or in case it falls out. Otherwise if none of these two things occure, then its still seated & sealed in the original slave cylinder.
ok hopes this helps as I know it will happen to many others also attempting to remove and replace transmission for the first time.