Your surmisings are likely to be correct and the conflict of interest has been caused by his mother putting her oar in but, unless she was present when he assaulted you, she can only be called as a character witness which suggests that this is his first offence - or the first time he's come before the courts.
You should have opportunity to speak to the prosecuting barrister before the case is heard at which time you can make your reservations about his mother known and ask that issue be taken if she tries to claim that her darling son is entirely innocent of any wrongdoing, or that you provoked him or similar.
Tomorrow's (more properly today's) hearing will be to remand him further and adjourn pending the transfer of the case to Liverpool. Hopefully a date in March will be confirmed for the final hearing.
Will you be giving evidence? If so, have you asked for screens to be put in place so that you do not have to see him (the defendant)? You may find Victim Support helpful www.victimsupport.org.uk/
and also bear in mind that as a victim of a crime you can file a claim with the Criminal Injuries Board if you are so minded.
With regard to the current restraining order, I would imagine that the '28 days' was granted as a failsafe to protect you if the case was delayed. However, regardless of whether he's found guilty or acquitted, there's no reason why the existing order shouldn't be extended for a specified time or until further order under Section 5A of the Protection from Harassment Act 1997. Again, this is an issue to raise with the prosecuting barrister.
As advised before, continue to ignore any letters his mother sends you and discuss the following with your solicitor in order to keep your child safe in the event that proceedings are issued against you in the family courts:
- Any contact with his child should take placed in the supervised environment of a contact centre for at least six months, or longer given the two further conditions below, the cost of which should be paid for by him.
- He should agree to undergo hair strand tests for drugs and alcohol every month for a year.
- He should attend a DAPP (domestic abusers perpetrators course) before being allowed unsupervised contact with his child.
- Given his mother's interference and insistence on contact, applying for a Prohibited Steps Order requiring your child to be returned promptly after contact would be a wise move.
As it stands, if he failed to return your child after contact the police are unlikely to act as he has shared parental responsibility and you would be placed in the unenviable position of having to wait to apply for an emergency PSO.
Frankly, I wouldn't put anything past his mother and have no doubt she will do whatever it takes to have access to your child including accusing you of all sorts and withholding your child after any contact she's able to have.
Finally, discuss an application for a non-molestation order if the court doesn't extend the existing restraining order.
I hope that none of the above has alarmed you or caused you to panic. Who knows his mother may turn into a sweet old grandmother with wolf's teeth-- but I prefer to consider every eventuality, anticipate what the other side might do, and head them off wherever possible.
If points 1 - 3 are put into place it's likely he'll fail and your problems will be over - until mummy he starts up again.