Ref suppliers:
Anyone who recommends Gardiners seem to get a panning from certain (not disinterested) parties but I'll give it a go and put my tin hat on.
I've never dealt with anyone better than Gardiners. They are head and shoulders above most suppliers. If you ask for advice they will give it. If a component fails they will replace it. Their poles are heartily recommended on here by people who use them daily. They deliver quickly. Bluntly, I do not use anyone else for WFP equipment if they stock the item.
Their only weakness is that they are sometimes too busy for their phone answering capability. Now, I've never suffered that but plenty seem to have. I do tend to phone mid morning, which may help. However, if you DO have to leave a message, they call back.
When I set up I called, spoke to Alex and basically said "I have an empty van; what do I need to do to get going?". The next day I got a quotation for the lot.
Water treatment: I call June at Gaps Water. She knows more than anyone you're likely to meet and will deal with you with a joke and a smile. Again, prompt delivery, though if they go on holiday they shut the business, so don't leave things late.
So, there's my tuppen'orth.
Vin