Well count me out as being an avid detailer, what I'd like is a foam wash then hand wash with a type of polish/shine (one product) then hand dry also a spray for the wheels and last but not least a dashboard cleaner.Robert there are a bazillion products out there, from the occasional washer to the more avid detailer. What do you want to achieve and what's your budget?
Do some research, read up and do it yourself it's very rewarding once you get into it.How long would this last 3/6 months?, looks good value but I'm not in the UK.
Maybe I'll leaving the cleaning to the pros if I find a good place for reasonable price.
I've never found shampoos to really be an important step in the process - as silly as that sounds - I use Angelwax shampoo which is up there with the best I've used but if you have a good LSP most of the dirt should come off in pre-wash meaning the shampoo has very little work to do anyway