Perhaps it's time for the FRA governing body to stop precluding technology that is generally available and legal to use. What the FRA should do is make recommendations for or against the use of a technology and possibly impose conditions of use if justified (assuming they have the knowledge to make an informed view). Risk of fire, well IC engines and petrol is allowed so what is the greater risk? For me, it is down to the EO to decide along with the venue hosts what can and what cannot be used surely?