Gazzer,
Definately illegall in the UK I'm afraid. The CAA (stands for the Campaign Against Aviation IMO, but officially the Civil Aviation Authority), have banned us dropping or firing anything from our models in the UK. That said you can always apply for an exemtion. I saw it done at show with rockets fired from a model of a Hawker Tempest at least 25 years ago.
I want to fit flares on my Mig 29. Tactical departure, Full burners, rotate into the vertical, gear travelling and make with the flares!
That would be something.
Regards,
John.