Has anyone seen Tony Slattery?

The press party for ITV1's Kingdom - about a country solicitor (played by Stephen fry) and due to start later this month - was a bit too interesting. Manic-depressive Tony Slattery, who plays a cantankerous villager, was expected but didn't turn up. At some point during the do, he phoned a PR to say he was at King's Cross and would be there "soon". And that was the last we heard from him. Apparently he didn't sound very well. Of the other manic-depressive, Fry, another cast member told me he was "low" during the filming of Kingdom and hardly spoke to anyone off-set. But he was back to his scintillant (other) self at the party.