Huge backstory which I will try and be brief about - abusive and controlling exH who we discovered recently has been spending my daughter's inheritance on school fees and holidays without her knowledge. That's a separate subject but just to give you a flavour of what he is capable of.
My daughter turned 18 a couple of weeks ago - she had a junior ISA (which will now be a full ISA) in her name where other money she has inherited from her GPs has been invested - my ex has had control of it up until now. He had promised to give her the details on her 18th birthday but this never happened. He is now avoiding the issue and side-stepping any questions she asks him. Classic avoidance tactics.
My question is what we can do legally to get her access? We know who the account is with, can we just contact them and explain the situation? I'm concerned that he will withdraw money without her knowledge.