It is not against the law in the United States, but I am unsure of the laws in the United Kingdom. It's a service and generally labeled "for entertainment only" for legality purposes. They cannot claim that it is truth without possible law suits and BBB intervention.
Do not confuse "fortune telling" with "future telling". Divination is not truly meant to tell the future, it is meant to read your past and present in relation to what it may mean for your future. It's the same thought as, "you have been going straight, you are continuing to go straight, and if you keep going straight, you will fall off a cliff". If a cliff is in front of you, then it only makes sense.
And programs like Mora are purely entertainment.