They look fabulous. Green with envy here. Lots of varieties of potatoes have purplish patches. Can’t remember whether Kestrel is one of them* but there’s nothing at all that would concern me, other than have you got plenty of mint to cook them with? 🤤
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Edited to add:
https://www.gardenersdream.co.uk/kestrel-seed-potatoes-second-earlies-p6151/s17925?cid=GBP&glCurrency=GBP&glCountry=GB&msclkid=2892e2c7aa591e80a5708049e57b99db&utm_source=bing&utm_medium=cpc&utm_campaign=%5BVS%5D%20-%20(SC)%20-%20SMART%20-%20Outdoor%20Plants%20-%20Fruit%20%26%20Veg&utm_term=4582833217426696&utm_content=Ad%20group