A CAA Class 2 medical was all that was needed for the R/BCPL for paid instruction.
When the CAA rushed to embrace JAR-FCL in its indecent haste, they made the following changes
without any consultation:
To instruct as a R/BCPL/FI you needed a JAA Class 1, not a CAA Class 2. Vastly more expensive and impossible for some FIs to achieve. When I asked the CAA about this, they merely said that they'd made the change 'because it was easier to have one system of medicals with 2 levels than another system with 3'. When I pointed out that the CAA Class 2 still existed for balloonists, the person I asked moved on to another topic....
The CAA also doubled the cost of maintaining the R/BCPL by reducing the validity period from 10 to 5 years 'to bring it in line'....
Now they are prepared to see it disappear altogether under the madness that is EASA Part FCL.