How to retro fit a trickle vent in a uPVC window

How to retro fit a trickle vent in a uPVC window window slot vent
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window slot vent Excelsior Windows & Conservatories has the solution to this, by using the Overhead Concealed Trickle Vent Cover which not only hides the trickle vent, but also

window poker Trickle vents are background ventilators integrated into window frames and door frames to allow a 'trickle-feed' of constant airflow from the outside to an Minimum Corresponding Vent Glazing Length & Slot • Natural upward deflection • Gas regulation mesh insect grille • Ready-made and bespoke sizes • Bar Length