Sorry. I stand by what l said. You shouldn’t challenge anyone for parking in a disabled bay if they are displaying a valid blue badge. Firstly the personal details of the badge holder are not displayed and as a member of the public you have no right to see or handle the badge - neither do you have the right to question anyone about their condition, should it not be obvious, or ask if they are the badge holder. Only a police officer or parking warden are authorised to do this, and the badge holder must comply with any such request.
If you, or indeed anyone else on the thread, suspect misuse take a note of the registration number of the car and the badge serial number and report it to DWP on 0800 854 440. That’s the National Benefit Fraud Hotline - they will check if the recipient of the badge is claiming any disability benefits and take the appropriate action. You can also report it to your local council via their website by navigating to the section on parking, which should have a subsection for disabled parking. You can usually report anonymously. If you have your phone with you a photo of the car parked in the bay will be helpful.
For cars parked without displaying a badge, make a note of the registration number, date, time and location - you can also take a photo of the front of the parked vehicle so it’s clear there is no badge, and make sure the registration is shown. Report to your local council. This also applies to commercial vehicles - make sure the company name and any contact details are recorded.
The above applies to onstreet/public or other council run sites. For private car parks such as supermarkets or on private business/residential grounds, look for signage giving the details of the operator and contact them directly.
A couple of things to remember before you report. Not all disabled bays require display of a blue badge - some are concessionary and not enforceable. The signage in that case would not include the blue and white disabled plate or specifically say blue badge must be displayed, On street marked disabled bays in residential areas are not exclusively for the use of the householders requesting them. Any BB holders can park in them but those parking without a badge should be reported to the council as they have responsibility for enforcement.
And one final - and probably very obvious point. Not all disabilities are obvious. As a disability outreach worker one of the less pleasant aspects of my job was supporting claimants who had had their BB suspended while the LA, or DWP investigated reports of misuse. Some had unknowingly misused them as they weren’t fully aware of some rules, and others - the majority - had done nothing wrong.
Before reporting everyone should be aware that when a report is made, the BB holder could be subjected to an interview under caution and during investigation could potentially have the BB suspended along with any disability benefits if the badge was awarded on automatic eligibility. It can be disruptive, frightening and traumatic. So before you report, think twice and a third time and remember that the issue of the badge is between the claimant, their doctor and the authorising authority. It’s not the business of a random passer by to decide that just because they can’t see a disability, there isn’t one.