Building Regulations demand that all glass which is in a safety critical location or in large areas of glazing should have impact resistance in order to prevent injury following accidental glass breakage.

Any glazing you have installed in these areas should be toughened or laminated and marked with a stamp to confirm; the number of the standard it is tested against, the level it achieved and some sort of identification of who supplied it.

If you have any concerns about whether glass has been installed to the correct standard, refer first to your window supplier and if you are not satisfied with their response go to the Glass and Glazing Federation or your local Trading Standards Office.