Tony
Both these systems are simple, save yourself tons of money and buy a 4040 kit from gapswater (£487 - basic kit), any local engineering/fabrication firm will make you an aluminium frame board to mount it all to for about £70.
Depending on your water pressure you may need a booster pump (£200) and if you want 2 IBC tanks they can be had for £30 or so each all cleaned out and ready to go.
total spend £817 plus £20 or so on fittings and you've got a top quality system for well under £900.
Then you'll need a submersible pump (£40 from machinemart - einhell 240ltr/min with float switch)
Transfer hose and nozzle £25 and £25
Grand Total - £927
So for just over £900 you'll have a pumped 4040 system, 3g housings, on an Aluminium board with 2 x 1000ltr tanks, transfer hose and nozzle.
same thing from Brodex is 2495 + VAT = £2931
Total saving for at most a couple of hours work - £2000!!