“It is plain that an application as wide-ranging as the one made as late as this one has been made will threaten the trial date because if permitted it puts in issue allegations that were at least impliedly admitted and raises new positive cases not before mentioned that involve both issues of law and fact, as well as raising for the first time claims by way of counterclaim not previously mentioned. Since the proposed amendments all post-date the service of the witness statements served in accordance with the CCMC directions given in March 2020, it is inevitable that all the new issues would have to be investigated. It may be that additional witness statements would be required, possibly from individuals who are not currently to be witnesses, and it is possible that disclosure will have to be re-visited as well. None of this could be done without vacating the trial.”