Thank you for the comments guys, glad you appreciate it. A few people don't see the point in me keeping my Megane the way it is but I love the car. I would love to have it in 15-20 years time as the best example of it's kind. Like when you see a retro Renault now, like a mint 5 GTT or Clio Williams.
Matty_225 - the inner arches are standard mate, I'm not sure if it's something they changed on the spec at some point though. Knowing Renault it could be just a spec change, they tend to do that from year to year.
As for cleaning gear, I could bore you to death with the different stuff I use haha. But on the Megane use pretty much all Dodo Juice products -
Dodo Juice Born to be Mild shampoo
Dodo Juice Need for Speed or Lime Prime Lite polish
Dodo Juice Orange Crush or Supernatural wax
Dodo Juice Red Mist spray sealant (to top up the protection after each wash)
That usually does the trick on the Megane although there's a few other brands I tend to use for other things like the plastics etc.
On the Twingo I haven't needed to polish as the paint was pretty much un-swirled when I picked it up. Having said that if I were to polish I'd go for some Autoglym Super Resin as by hand it's awesome, virtually non abrasive but fills swirls and leaves a great finish. Plus you can buy it in Halfords so easy to get hold of.
Wax wise I like to use something I know lasts ages so usually Collinite 476 or Finishkare 1000P, they're no frills waxes that lasts up to 6 months per application.

Having said that I've got numerous waxes but those two are spot on.
Otherwise I just use a few other products, Sonus, Meguiars, Chemical Guys etc. There's no definitive brand or product to use really. Also it's easy to become a snob and ignore more obvious brands but there's good and bad in all really.
Hope I haven't bored you to sleep yet haha.