Sourcing El Rey chocolate (or substitute) in the UK

I used to buy El Rey Gran Saman (70%) and Mijao (61%) Venezuelan chocolate in the UK in 5kg boxes of discs. My previous supplier is delisting El Rey and selling off -- albeit not at a reduced price -- their remaining stock. They have no Mijao left and the best they can do is 20kg of Gran Saman with a use by date of the end of September (i.e., three weeks)! El Rey have a US site -- and I've found other US stockists -- but they don't deliver to the UK (besides, the shipping would likely make it unviable).

This is perhaps not suitable for Seasoned Advice, but does anyone know where I can get some Mijao and/or Gran Saman? (I don't really need that much: 500g would be plenty.) Alternatively, can anyone recommend a substitute Venezuelan couverture in the 64% cocoa range that is readily available in the UK and is of a similar quality? (e.g., I'm not a fan of Belcolade or Callebaut. I guess, as I need a relatively small amount, I could pay over the odds for retail bars and use them as a last resort.)