Today we took delivery of the Velux windows (and additional slates, to replace broken ones).

There are two electronically-operated opening windows to be installed at the top of the stairwell, these will be connected via a Velux-supplied control unit to the fire alarm - and also switches to enable the people in the house to open and close the windows (pretty much like electric windows in a car).

What I didn't realise until it arrived was how big and heavy the control unit is: looks like it's built to withstand World War Three!