Dualpumps can supply almost everything regarding a vac and hose, poles are up to you, some of us use carbon Superlights, Generators are easy to google, extension leads - probably need to come from a wholesalers depending on what power vac you want to use. You can buy a Polarvak already made up or Omnipole if you want to spend loads. Cameras can be sourced from Maplins if you only want to inspect with it.
Do a search on here for diy guttervacs etc. Stacks of info about and amusing arguments.