I have no idea, I would ask the barrister how s/he proposes to deal with it if a costs estimate is not to be prepared by a solicitor bearing in mind the court has specifically stated this is to be a costs management case conference.
If the barrister can actually save you from the expense so much the better!!
OK we have 3 months , ask him under what provision, regulation or basis is it that is that if you turn up with him alone you do not need to file a costs estimate.
The barrister may well be right. You can act as a litigant in person and use a barrister just for hearings and it would be unusual for a court to expect a litigant in person to provide a costs estimate as this generally relates to the legal representatives costs.
Your representatives costs would be limited to appearances at court.
So , he might be right , but I would like the barrister to give an explanation so we are both satisfied.
In the absence of costs issues the court would still give directions to the parties regarding preparation for trial - exchange of documents, statements , bundles for trial and timings
Ok the Costs and case management conference is not to do with your claim for damages, compensation etc but solely the representatives costs. So failing to put in a projected bill of legal costs will not affect your case.
The barrister has explained the real reason for the hearing which is to give directions for management of the case to trial, list of documents, witness statements etc.
I see no reason not to go with the barrister on this, the reasoning is sound.