Are you going full wfp or tops only ?
What's your TDS ?
Scrap the 100M hose and reel, grab 30M of 8/6mm microbore/pole hose and get a sack truck. As said above, grab a few more tubs.
And the vat goes up to 17.5% on 1st Jan, not a day before.
The backpack your buying is a cracking piece of kit. That's what I started out using.
I'd convert a harris pole too, them 27ft fibre glass poles can get heavy.