I agree with Phil in every respect concerning Zymol and have been a fan for +8 years. First started using the 2 simple shampoo and then clean and wax products from Halfords on brand new dark metallic blue Mercedes paint on our +8 and very satisfied with results without going down the exacting detailing route. Then progressed to using same products on Merc and Audi. With a polish every 4-6 weeks, weekly washing of a combined 1K miles of motorway usage just got easier and easier as the wax repels most of the dusty dirt which just got washed off with an initial hose spray. +8 didn't do the same mileage and just shone sunny
With the arrival of Aero8 and an A6, they both got the Zymol concours wax (from ebay) treatment from new and subsequent washing is even easier.
My only observation is that on the Morgan, Bentley Silverlake does not have the depth of shine in the same way as the dark Azzurite Blue did, but I think paler metallics do not mirror the light in the same way that a dark or black colour will.

I love the smell of the Zymol (can you use it in the shower? laugh2) and imho is excellent value over time and helps protect my sets of wheels - I like clean shiny cars but I am not a detailing fanatisist(?), I still use a soft sponge and the mid-range Zymol products meet my needs.
Got caught under a flight of canada geese recently, you should have heard the thumping splat on a hot bonnet scared but with Zymol...ach, nuff said.