Thank you for raising this. I am sorry to hear you have been put in this position.
The issue of ID requirements has been an ongoing discussion on the board and we are aware that some members are continued to be asked to show an ID badge.
As self employed professionals with voluntary membership to ASLTIP, the ASLTIP membership card is not a form of ID and we advise that members carry official photo ID (driving licence, passport etc) as well as DBS check. Schools can also check HCPC register online to check registration status here: https://www.hcpc-uk.org/check-the-register/