You have told us the company you work for is being taken over.
The new employer needs a new disclosure they can't be transferred, daft I know ( been there myself) but true.
All I am saying is that your new employer MAY just MAY decide that a caution and a restraining order are too much to risk employing you. It will be the employers decision, all you can do is be open from the beginning and explain what happened and why it happened. Then explain why it is no longer relevant.
No one was saying you agreed to be assaulted that would be ludicrous. But you agreed to both a caution and to a restraining order. By agreeing to these you accepted all that the prosecution said which is the same as pleading guilty. You had the option of fighting these charges in court, if you had done so and been found not guilty then you would have nothing on your CRB check at all.
I am NOT judging you I am just pointing out that in this case your new employer MAY decide not to employ you. That is up to them alone, nothing to do with me or anyone else you ask advice from.
The fact that you have been working in the job with no problem is a factor in your favor, but as I said it is possible a new employer will take a different view.