On 22/07/2018 19:31, Tricky Dicky wrote:
Remove the glass panel and you will find the fixing screws there.

Richard


Quite possibly but this house has cavity closers fitted and the
windows should just clip into place.

No evidence of fixing screws where the top vent hinges out so
I would carefully remove the external mastic between window and
brickwork and slide a metal rule up and down to see if these
clips can be located. then its just a matter of using the ruler
or a paint scraper to unclip the latches.

take the glass out FIRST, because thats where the weight is,
(which might reveal some hidden fischer screws too).