I am pulling them down. There is a lip on the metal clip which I place edge of s/driver on, then either push down or lever down as hard as I can 'til top of clip appears. (There's not another 6ft of clip above that is there for gawds sake?) At this point, I try to lever vent out. Vents are closed. The facia just pulls partially away from the main body of the vent, the vent vertical fins go ping, ping, ping and it ends up looking like a manky gob, and I am afraid it will come off with a big snap.
Remember when Basil Fawlty whipped his car with a branch? The neighbours thought I was doing a re-make only with the Hulk as Basil! (Don't make me angry, you won't like me when I am angry)
Wife "want a hand?"
Me "Eff off"
Wife "Cup of tea and a bikkie?"
Me "Eff off"
Wife :You coming to bed? It's 3 in the morning!"
Mw "Eff off"
Wife "Shall I Eff off?
Me "Yeah, and you can Eff off too!"
I am now Hyper-VENT-ilating!
In tomorrows episode,Petach storms Shenfield High Street with a Kalashnikov, firing at random and lobs grenades into the local Tesco Metro.