I have found a pack from a Razor Blades Club purchase I did a while ago. I will use one tonight, one pass in my testbed Fatboy and one in my Fasan open comb Slant, and post it in SotD.
Annoyingly it looks like I used two in the pack of 5 but didn't make an entry in my blade review spreadsheet so now I have no idea what I thought of them! I'll correct that after the shave.
Treet New Steel Professional Double Edge Razor Blades 200 blades(1pc) for Barbers
nmbeautyonlineshop.co.uk
They do very good prices on other Treet plus Derby and Astra bought in bulk.
I've bought from them once before quite a long time ago and had no issues.