Hi sorry for the late response but here is the uk version of Amazon hopefully it says that its aavailable.
PinBoTronix Digital Battery Capacity Voltage Checker Controller Tester with LCD for LiPo Life, Li-ion NiMH Battery Amazon.co.uk
Ye get one just like in the link and you can the use the cable from you drone battery to plug it in. And then you can test all cells % or all the individual cells %...