CPLs are not required for BFRs and I think the Association ensured that all the coaches now have CRI status.
In order to be able to receive payment or valuable consideration for aerial work one needs at least a CPL and Class 1 medical, unless there is a CAA exemption such as exists for microlighting.
Indeed no need for a CPL for BFRs, a CRI will do, but most CRIs will not have CPLs I hazard a guess.