PKI revocation as a technology is definitely not the greatest thing in the world, the best protocol at the moment is OCSP with a specifically configured Validat

PKI revocation as a technology is definitely not the greatest thing in the world, the best protocol at the moment is OCSP with a specifically configured Validation Authority. But even then quite a lot of OCSP implementations in modern software are configured to continue if they can't make a connection. Fortunately, because the usage of our CAs is very tight to Monzo and our partners, we can reach out and explicitly ban a certificate from our machines (and tell partners to do the same) without too much trouble (as compared to Public CA's who have no chance of being able to do this) in addition to following normal PKI revoking procedures.