A nice set you've got there! £409 is more than the cost of a scrapyard car.Back in 2000 when in Italy at the Co-Op in Cortina I bought a bargain ABC Tools A3115/5 socket set (surface drive) for £94.95. It now costs £409.30.
https://www.abctools.it/en/prodotti...9-chiavi-a-bussola-e-accessori/a31155000.html
Packaging has changed.
Prior to this I was using, and still have Kamasa 1/2" and 3/4" drive, which many of us oldies used for many years a long time ago. The 3/4" drive is a real nut buster as there is no 1/2" shaft bending and springing.
I ended up buying a good set of sockets, just the wrong ones for the job, so I bought another set and promptly lost the only size I needed! I'm a bit bemused by the loss but its been so wet I haven't got close to doing anything on the car anyways.