The best ESR meter I have ever used was the one designed by Bob Parker. I have the kitset version of it made by Silicon Chip, available from Altronics with a lovely black housing and Red LED's, but they come in other forms:
https://www.altronics.com.au/p/k2574-esr-meter-kit/
(everyone with these falls in love with them)
https://www.ebay.com/itm/AnaTek-Blue...e6b6:rk:1:pf:0
Not 100% sure where to get these Bob Parker meters in the UK, but I'm sure they will be around somewhere. They work on a low level pulse principle, great for in circuit testing. Generally I have been disappointed with the sine wave principle meters.