Sorry my bad, I was just trying to point the original message poster to some information that may have been useful.
Did a bit digging on other products mentioned in this post and this is what I can find.
Wheeler FAT wrench manufactured in China comes with calibration sheet (wheeler’s website says The FAT Wrench Bits are built to last and are made from S2 tool steel and hardened to 56-56 Rockwell “C”.) £79.95 @ Optics Warehouse (I bought the digital version of this and hated it, a friend has the manual one and thinks it great)
Vortex torque wrench manufactured in Taiwan comes with calibration sheet (I think it’s also covered by the Vortex lifetime warranty.) £96.95 @ Optics Warehouse
The fix it sticks website say that all Fix It Sticks products are designed, engineered and tested in Chicago, IL and manufactured to exacting standards at high-end facilities in Taiwan. (recommended by Spuhr and sold on the Spuhr website) I think the cheapest way to cover the 18 and 50 inch pounds would be to buy 3 separate items 1 x wrench and 2 x small torque limiters (3 x £42) total £126 @ fixitsticks.com
Wera torque tools manufactured in Bystřice Czech Republic and calibrated in Wuppertal Germany again I think the cheapest way to cover the 18 and 50 inch pounds would be to buy the Series 7400 Kraftform adjustable torque screwdriver (1.2-3.0 Nm) £68.95 and the Series 7400 Kraftform pistol grip, adjustable torque screwdriver (4.0-8.8 Nm) £100 total £168.95 both are available on amazon uk
So the 3 other products are all shooting supplies branded Chinese tat and only one of them comes within the £90 pound budget. So it looks like the best advice would be to save up some extra cash and learn about lubrication.
Disclaimer, I’m not an engineer or have I ever claimed to be one and I’m certainly no expert on lubrication.