Wow.. you guy´s in the UK have some weird rules if this is true
But I agree with Helinut. It´s got nothing to do with renumeration or commercial licence but has everything to do with public transport i.e. JAR-OPS 3 work. Where JAR does restrict pilots at the age of 60 to fly multi crew only until 65 and one pilot has to be under 60.
In my country Aerial work requires AOC, this is clearly different from the UK rules. And any commercial pilot with valid 1st class medical can do aerial work in Iceland and Denmark. Both countries are fully JAA compliant. But then again Aerial work is not really covered by JAR so national rules apply.