Thanks for letting me know Darren about the site! I had to hunt you all down on FB like dogs!

Just to let you know I had it done and it's pretty good, it's not a dramatic change by any means, the guy said he could only safely take off 17% of weight reducing it from about 7KG to about 5KG.
Must admit it's more revvy and I notice the best of it when I push 1st and 2nd gear (looking forward to taking this on a drag track), the rest of the range feels about the same, the higher the revs the more I notice it.
Downsides? None really! the engine feels like it's grumbling abit more between 1000 - 1200 revs but I was told this is normal, along with the engine as a whole seeming slightly loader but I'm rather pendantic about that kind of thing. pulling off I feel like I have to give it a few hundred more revs than before but I got used to it very quickly.
Anyone wanting to get it done, my garage had someone do it for £50 whilst my clutch was being done and I got good value for my money, they refaced the flywheel as well as balancing (and taking the weight off of course). I would advise anyone to get it done but give the car a very "Spirited" test, if you're loosing revs close to your redline, there's a problem, I did a lot of research into this to make sure I didn't break anything and I'm happy with the results!