Working as an Area Fiso in Scotland we are advised of TRA's or TDA's as soon as they become active...( these are mainly to protect SAR helicopters whilst conducting a search, see the TRA this morning over the Cairngorms) the best way to find out about them is to use the FIS service...here in Scotland 119.875, if we are talking to you and think you may be routing close to a TRA/TDA we would advise you!!! The service is there to be used, so please please come up on the fequency and say hello!!