I may be stating the obvious here:- Gas network isolated - included any LPG pipework running to or from the building. Electricity isolated at the main incoming supply network. Water isolated, again at the main water mains for that building. Asbestos register for the building will need to be reviewed BEFORE the structural engineer can enter. If none is available, I think I am right in saying any building prior to 1980 can be considered to have ACM's, although someone may want to correct me on that. The Institute of Structural Engineers may be able to help/advise on finding a qualified engineer. http://www.istructe.org/Pages/default.aspx Hope this helps

Fire can leave some pretty noxious deposits behind, dioxins, HF etc. Don't let people just dive in and fish stuff out or try to clean it up themselves.

I would suggest the approach taken by fire fighters where they use the "safe person concept" in that they cannot control the environment then they must be trained to be safe in that environment and have the skills necessary to be safe in it. Firstly no one should be alone, be aware of the signs of collapse, SSOW, full PPE including RPE, all information on building before entry,(history of fire/damage from fire service if appropriate) emergency procedures, first aid, competence of person to operate in that type of environment, decontamination even if it means just bagging up gear after exit, and the most important one its OK to say no (if its to dangerous or looks like it could be don't go in)