Hi Squeaky,
Sorry to hear of your injury, not good.
Glad that you are considering WFP.
First step to getting things sorted is to put your prices up! If you lose a few customers you will still be getting the same money for less work (got to be good for your health)
Good to hear that you can raise the money, it will be well worth it. Here is an idea that many have done, take out a new credit card with an interest free offer on new purchases (egg do a great one that lets you transfer money to your bank account), then you can go to one or two suppliers and buy everything on the card. Saves quite a bit in interest payments.
My take on what you need is
2 poles - £200 approx (drop me an email, I have some Super-Lite parts lying around that, with a few new parts can be made into a very nice 4 section 24ft pole)
and also a 12ft extender with an SL brush, which is very light and more adaptable than the Super-Lite for smaller domestic work. This will give you a fantastically light pole set-up which is where most of your thought needs to go as you are nursing an injury.
RO system - £150 approx(this will save you money hand over fist within just a few months) buy a small 200gpd type system coupled to a good size holding tank, say a 1000litre IBC (a few quid if you know where to go)
Transfer hose and shut-off valve 20m 11/4" £47 + £14.25
If as you say you are down 14 steps then you may well be able to gravity feed the tank in your vehicle. So all you will need is some hose to do so, 1" 1/4 transfer hose will be the fastest but also more expensive, so choose whether you are prepared to wait half-an-hour to fill your tank. You will also need a shut off valve on the vehicle end to save flooding your vehicle. Or add a submersible pump to do it in about 4 minutes.
Now to your vehicle
400 litre flat tank - £153+£20 delivery (or try and buy one second hand)
60psi Flojet and strainer(essential) £122.40
Connecting 1/2" hose, jubilee clips, Hozelock endstop, tank elbow, £12 approx
60m Hozelock hosereel (do not get anything heavier) £27
60m microbore and fitting kit - £44.35
And that is it.
Total cost = £790 + vat + £30 delivery
= £963 total
Ways to reduce this cost
Buy a second hand tank (save about £90)
Buy a cheaper RO unit off ebay (100gpd) it will be slower but you will have an IBC to give you a reserve (save £75)
Buy an 18ft Universal pole with SL brush, not as light as the 2 pole set-up above but cheaper to start with (save £120)
Use your own garden hose reel ( save £31.70) but do not sacrifice the microbore!
New total £647 total.
I have based all prices from our website for simplicity, but these products can obviously be bought elsewhere.