So I updated to 'cm9_nightly_20120607' and added all my apps back and it all seems to be working sweet as. I do have to fess up that i straight upgraded using cwm without clearing the caches first even though advised to - my bad but i thought i'd give it a go and if it didn't work then i'd go back and do it properly. Also I never ran the gapps zip file as everything I needed was still in/on my tablet. I'm sure that if I do need it then i'll find out pretty soon
My findings are that:
Iplayer runs faultless even through pauses it never loses lip sync or never stutters.
Youtube same as above.
Browser is quick and responsive.
Camera works fine and seems to present a clearer picture - not sure if that's my old eyes though!!
Google Earth is faultless with little if no lag.
So all in all a very nice and stable update, as always if anyone needs any info off my tablet or would like me to try anything out for them then please let me know what it is and i'll do my best to help out.
----- just seen that the tablet can update the rom to 2012.6.10 but will hold fire until i see if there are any benefits.