FWIW, I've settled on the Taylors of Harrogate "Brazil Yellow Bourbon Espresso" capsules. Really hits my taste buds; strong, but not bitter. Available from Tesco, Sainsburys, and Waitrose.

[Linked Image from taylorscoffee.co.uk]

Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.