He cannot file criminal charges in the UK. At least, it is extremely difficult for him to do so and uncommon in the extreme. I have never had a client do it in over 25 years in the legal profession. He may make a complaint to the police and allege bigamy but that’s a different issue.
If he is making it up because he has clearly been shown the divorce papers from India, then he risks being prosecuted for wasting police time.
He is going to need a certified copy of the divorce petition translated by a court approved translator who can confirm the authenticity of the document. Alternatively, a letter from a UK solicitor who knows about Indian law and who could verify the authenticity of the document and that it was a valid divorce, would also suffice. That is the first thing that she needs.
I can’t comment on the legal situation in India with regard to his complaint.
I cannot see how those allegations should affect the divorce and I don’t know what is holding it up.
Meanwhile, if she is concerned that whilst they remain married, he has some control over her, she can apply to court for a Non-Molestation order to prevent him coming within 100 m of her and if she was still in the house, an occupation order to prevent him moving back in.
If he breached one of those orders he is liable to be arrested because that’s contempt of court which is a criminal offence and would generally lead to him serving a short jail sentence.
Whilst there may not be sufficient grounds to prove assault beyond all reasonable doubt which is the burden of proof for the criminal proceedings, the matter of the complaint to the police is probably enough to satisfy a civil court where the burden of proof is only on the balance of probabilities (51%). It would be therefore worth seeing a solicitor with a view to getting a non-molestation order and because there is domestic violence involved here, she may be eligible for legal aid.
If you can tell me what the hold-up is with the UK divorce, I can tell you how to deal with that. If he is simply not replying to the papers, that’s easy to deal with by asking the court for an order for deemed service were all she needs to do is prove to the court that he had the papers and is ignoring them. She just needs to prove they went through his letterbox.