Thanks Sabre - 'er indoors had me on a Tesco grocery run this morning, I saw the GT5 which sells as Tesco Pro Formula For Men Diamond 5 Blade........................ if I'm not mistaken.
https://www.tesco.com/groceries/en-GB/products/281927706
I also had a look at the Tesco Advance Performance...
I'm fine with Matrix 3 meantime, prefer 3 blade razors as a general rule.
I've clocked the Triflexxx as own brand in the usual supermarkets, and the Magnum M5 is in Aldi as "Lacura" brand I believe.
I'm not familiar with Caliber 3 and 5, GT 5 and 6 and EasyFit3, who retails these in the UK ...
Try the Aldi "Lacura" own brand 3 blade cartridge razor - it's the Personna Matrix 3 model, as marketed in the USA, from Edgewell.
Great price and very acceptable results.
https://www.aldi.co.uk/3-blade-razor-shaving-system/p/067247020697600
6 replacement cartridges, same price, cheap as...