They clearly need alot of testing before they should be added into the FRA rules, and someone needs to test them. Personally I dont know much about these sets but get alot of problems with other 2.4GHz stuff interferering with each other, and strangly enough Ive a 27MHz set that stops anything I have on 2.4GHz working when turned on.

Wireless Joypads, Keyboards, mice, alarms systems, cctv, and alot of others use this band. Ive had most problems with mice, if there are 2 or more (even on different channels) Moving both at the same time more often than not stops one of them working.

Does anyone know how many channels the wireless routers use, I suspect they could even use all the channels to get the bandwidth, but although they claim to be 2.4GHz they could be on seperate channels.

Dont forget, Wi-fi & Bluetooth also use 2.4GHz, and If I remember so do microwave ovens.

Its the Department of Trade and Industry Radiocommunications Agency (DTI-RA) that deal with this stuff.