Hello my name is ***** ***** I will help you.
Who owns the grassed area please?
Have the Council investigated this at all? Or do you just want to know if you can drive/park on the grass?
Parking and access is easy - you have been using this for over 20 years so you have a prescriptive right. This right becomes absolute after 40 years. So they can't change or block it.
As for kids using it - really you should complain to the Chief Officer of the Council. They can investigate your complaint and why nothing is being done about it.If they do not uphold what you say then you can complain to the Local Government Ombudsman. They offer a free, independent service and can investigate your complaint for free. They can be found at: www.lgo.org.uk
Finally you can consider a Judicial Review. This is where a High Court Judge examines the decision not to do anything by the Council and sees whether it is legal and reasonable. A Judge can either agree with the decision or send it back to the Council for further consideration.
For more information on Judicial Review please see:
https://www.justice.gov.uk/downloads/courts/administrative-court/applying-for-judicial-review.pdfCan I clarify anything for you about this today please?