OCUK Mark Up's?

[Jim99]

Superior components, 3TB more storage, PCIe 5 instead of 4, Full suite of Noctua fans, Better AIO, custom braided cables, better warranty as 1st year is on site, £1000 cheaper when purchased, Now £500 as OCUK has dropped their prices on their high end system

Glad that you got a deal you're happy with.

I doubt OcUK are attempting to be the cheapest for any particular build, so probably good given your requirements that you shopped around a bit.