I agree with Richard Concept 20 will provide you with the best system and their knowledge and expertise will be invaluable their hot water systems are expensive but you get what you pay for.
So you get some good quality kit at an extortionate price, which really does equal some pure water coming out of a brush head (which was probably designed to sweep floors with in the first instance), what can Concept 20 do to turn you into a high flying window cleaner turning over £35K in your first year?
I'm sorry to sound sceptical here, but I am.
Spot on Tosh, he would be better off going to pure freedom, better still a second hand set up from ebay or here
I was going to say this too. As he needs a flying start, keeping the startup costs down are important as well as a fast build up of work. As far as I know, Pure Freedom are the cheapest system installers for vans. Also, it would be better to set up a purifying system away from the van. This might affect the choice of property that he moves into. A driveway and a garage would be a big help - especially to combat freeze-ups. I live in a flat and can't purify at home. So I pay rent for a storage lockup where I have my kit set up. As it's Swindon area the water will be hard so unable to get away with resin only filtering. Paying a bit extra for a driveway and a garage (if possible) will probably save in the longer term. The only "extravagance" I would suggest would be with pole selection. Gardiners for light weight carbon is definitely the best option - especially for someone in their 40s who is probably unused to manual work.
As for the BWCA/Ionics courses, although some useful things can be learned for a new person, going out for a few days with windies from another area would be far more useful. This can be fine tuned with courses later once the finances are on track. However, please bear in mind that BWCA/Ionics do try to steer you towards buying their products - albeit subliminally. Although some of their products are just fine, they do tend to be at the pricier end of the scale. Also, they do seem to unnecessarily complicate some aspects.
Can £36k be made in year one? Probably not from a standing start. However, if enough time and money is thrown at it with canvassing, canvassing companies, buying work etc., it may just be possible for year two - but it might require more devotion than a new father would be prepared to give. If a decent redundancy payment is in the offing this may be possible. Also, I believe that all the startup costs (up to £25k???) can be offset in year one these days so it could effectively give a tax free first year. This would probably reduce the need to get to £36k profit in year one. Though bear in mind that if these expenses are (mostly) offset in year one, they obviously can't be used again in year two. However, that may be what's needed as it would give a bit more breathing space in the time period when it would be needed the most.
One thing I would say is what was said to me when I first went self-employed.
Get an accountant.
You can probably get one for a simple business for under £250 a year (cost is tax deductible too). It's likely an accountant may want a deposit but you probably wouldn't have to pay the bulk of the cost until the first set of books were produced.