David Hewlett (Stargate Atlantis) has said that it would be his dream role. He is Canadian but was born in England. I think that he would be perfect for the role.
I trust Russell T Davies to pick the right person for the role, and unlike Chris Chibnell, write some decent stories for them. I'd be honest, I'd love to see what Jodie Whittaker could do with a decent showrunner in charge. She's been seriously let down by lacklustre storytelling.
If money and filming clashes were not an issue, I'd still love to see Chiwetel Ejiofor in the role. I think he would be amazing.