Sooo, I bought a Maguires Clay Bar kit from Halfords and has a go! ....bloody hell it's well easy
it was actually a pleasure to do and only took about 30 minutes to do the whole car 
The results are staggering
a really REALLY smooth paint finish like polished glass I followed the process with a Megs Paint Cleaner, a Megs Polish and Megs Carnuba Wax and it's great and really easy too - so in other words I carried out 4 processes on the whole car and I reckon the whole lot took about 2 hours
I'd been getting this polish/wax thing all wrong
the 'Wax' is the last part and forms a nice seal to whatever other process you've done. A 'Polish' is what the paintwork needs to create a nice finish and help with swirls/marks and a clay bar first makes all the other step *really* easy I'd also recommend a Microfibre Towel for buffing/removing the polishes.
(sorry to the Megs guy on here with the on-line store but I was bored on Sunday and *had* to get the stuff immediately - to be fair Halfords had it all on a 3 for 2 offer so wan't too bad, I'll remember you next time though for sure).
I just wanted to get on with it 
)
