He was locked up at the end of trial 2, after the Jury had finished deliberating but before the verdict was returned.
The specific problem that Tommy and others have identified is that these cases are very often covered with wide reporting restrictions that are probably wider than the courts have the authority to impose. Imposing reporting restrictions means that whatever press attention these massive trials get is limited to a single story at the end, rather than ongoing reports of some of the details laid out in court. Those detailed accounts never make the public record and can cost a fortune for the public to ever see (thousands of pounds to get transcripts after a public case).
All accusations that anything Tommy said could have affected trial 2 or 3 were dismissed almost immediately after he was jailed. These allegations were conclusively accepted to be nonsense in the appeal that freed him and evident from the fact that no charge like this was put forward now.