Criminalise unauthorised development & ban retrospective permission

We are calling on the UK Government to reform planning and enforcement laws, to stop anyone from placing in any green space hard standing or fencing, and from residing/ living there, without full planning permission already in place. We also want the Government to disallow retrospective permission in these instances thus putting a stop to any lengthy delays before remediation. We want to strengthen powers available to councils and police to deal with unlawful occupation of land where planning permission has not already been granted.