Jimbo,
Based on your information, I suspect you'll be struggling to contest this. As others have posted the threshold for a magistrate to make a order is set very low.
Before making a decision be sure you check that there is nothing in the FVRO than could impact your ability to be a parent to your kids.
-Does the FVRO recognize the existence of your consent orders and describe which of those takes precedence where there is a conflict? In our case, husbands ex made an FVRO application in response to the Family Court application, so orders made in the Family Court after that stipulated that the Parenting Orders would take precedence. Since your orders are historical, you may not have the same protection.
-Can you contact the ex for any parenting issue, or just arranging pick up/drop off?
-You’ve said it prevents you from going within 50m of the ex? That would potentially raise issues with your work but also attending school events- assembly, sports days etc if you both currently do that, even if you don't interact with her.
It could be worth offering an undertaking, should be easier if she is the applicant (rather than the police). Your solicitor can advise but in basic terms you make a promise to the court to abide to the conditions set out in the undertaking (in our case we pretty much mirrored the FVRO, although changed some wording so that husband could at least drive down the road school was on without threat of prosecution). Key difference that and the order is that breaching an undertaking won’t get your charged and risk a criminal offence, though it would not be looked kindly on by the magistrate and be held against you were she to apply for another order in the future. If you’ve learnt the lesson from this episode, it shouldn’t pose a problem for you. It is up to the applicant to accept and subsequently cancel the FVRO though- you can only propose it.
If she doesn’t take that, you’re probably best served accepting on a without admissions basis, however if any of the existing conditions are unworkable or leave you at risk of being in breach for going about your life, especially living so close and working in the same place as the ex, first test if the order can be amended to make sure you wouldn't be in breach for those things.
Be ready for a long wait in the system if you do contest- the (ex-parte) interim order was made against my husband in March last year, he lodged his objection within the 3 weeks period you’re allowed and was allocated a date in November, so had that order hanging over his head for 8 months despite the ‘evidence’ never being tested. I doubt the wait has improved in the interim.