The message
from Dave Fawthrop contains these words:

Make sure that you do not have to install toughened glass in the windows
which will increase the price, if with added security. Sorry could not
find a URL for that.

Not by all that much. I made ours toughened anyway, simply 'cos the kids
don't appear to respect gravity.

--
Skipweasel
Pay no attention to that man behind the curtain.