Hi, thank you for your question. His threats amount to intimidation and blackmail and should not scare you into not pursuing a financial relief application as this is your right. If he were to make such a report to thr police they have a duty to investigate but they will also look at other factora such as why they were not reported earlier and you have the allegation that he is making these issues up to prevent a claim against him.
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From the information you have provided, even if the allegations were true, I do not know where he is getting the amount of £35,000 that he would be awarded and it clearly appears to be intimidation to prevent you continuing with your application.
If he wanted to pursue any of the criminal matters it is something that will have to be reported to the police and the police would investigate this and would no doubt want to interview you about the allegations, therefore it would be highly surprising that he would have police reports if you have not been arrested or questioned by the police in the past. Some of the allegations do not have a time limit, for example the allegation of attempted murder if it had caused injury. If the other allegations are considered minor by the police, and did not cause injury, there is a six month time limit for him to report it to the police.
It will be difficult for him to prove anything so long after any allegations and his main motive for making a report now is to stop you from continuing with this application. At this time I do not think you should report the matter to the police as it may inflame matters. However, in the process of the financial relief proceedings you can raise his intimidation and threats and blackmail as "bad conduct" which the family court will consider as part of you application.
Again, I do not think, based on the information you have provided, that he has any strong claim against you which he can take to the police.