The company licence nobody asks about
This matters because a significant share of the informal market consists of clinic-employed physios doing cash-in-hand evening visits outside their employer's licence. The individual may be perfectly competent, but the arrangement is unauthorised: there is no clinical record of your treatment, no supervising medical director, no facility insurance covering the encounter, and the physio is personally violating the terms of their licence. If they injure you, or simply if your recovery stalls and you need documentation for a surgeon or insurer, the treatment effectively never happened on paper.
So the verification question is two-part: is the person licensed, and is the entity sending them a licensed home healthcare provider? The second is easy to check by asking for the company's facility licence number and confirming the category. Providers operating properly tend to volunteer this, because it is a genuine differentiator against the informal market undercutting them.