ive got a kangoo.get a roof rack!i got mine from motorworld near me for £70(£110 in halfords! :

)
if your starting out trad youll need a 3.5 metre trade ladder(bout £120) for 1st floor windows(and placing the ladder ABOVE first floor windows on some houses).
if your starting out and doing a lot of dirty first cleans then wfp will be next to useless if they need scraping or their old wooden or oxidized frames.you need to be up close to do a good job.
if you ve no experience trad window cleaning then i would get a few days work with a local windy and learn how to mop and blade to a half decent standard/pace then get a wfp and avoid ladders altogether(apart from some stepladders for reaching over some kitchen extensions/flatroofs with the pole/unlocking/climbing over locked gates etc).
ive been a trad window cleaner for 16 years but im having trouble with one of my knees!so the sooner i go wfp the better for me!!ive also had 2 falls off the ladder.luckily i was ok.i got away with a sprained ankle/back.
best wishes
dazmond