Well, it is not that simple. You are describing an offence.
I know that you are not describing abuse but despite what you read in the papers there is very little real domestic abuse in the UK. Most of it is a load of nonsense. I think most people have rows that overspill into minor acts of combat to a certain extent. Sadly some people seem to think they can call the police about that.
However you are describing wrestling and that is an assault. You might have self defence available but it is always difficult to run self defence against a woman. This is why your solicitor told you to make a no comment interview and he was spot on.
However, if nobody is giving evidence and there are no photographs of the injuries then it will all disappear into nothing. They are probably trying to rely on the res gestae evidence of the 999 call or some other desperate twaddle.
You should report this shocking waste of money to the taxpayers alliance. I don't blame the officers at all. It is a policy of the police that is to blame not the officers individually.
That said, in fairness, it can all be avoided if people don't call the police. Don't make too many allowances. You are where you are now because he called the police and you have every right to be annoyed.
Can I clarify anything for you?