You will no doubt be working with a medical person on getting the right coumadin dosage to “stabilize your INR” (clotting factor number). The significant thing is vitamin K intake. Some foods (like Kale) are high in vitamin K, and you may be counseled to avoid them. (Read the brochure they probably already gave you…)
Anyway you should show that person the nutritional profile of Huel (here is the US version, sorry I’m blocked from the UK site…). That US nutrition panel shows that 2000 calories of Huel has 120% of the RDA for vitamin K. That’s not a huge overage, and if your diet is consistent they can easily adjust your dosage to get the right INR against that intake of vitamin K.