Autocruise Vista 2001 Dome Light

[Burstnerite]

Really stupid question ?! I'm trying to remove the 'glass' fitting from a dome light - to clean the inside. There are several slits in the surround I've tried inserting a flat blade screwdriver in to prise down, but with no success. No apparent visible screws. Don't want to use too much force for fear of breaking the 'glass'.
I know someone out there will have replaced the bulb in one of these things. Yes ?

 

[ambulancekidd]

If its the same as ours then the "glass" cover just needs to be pried off with a small thin screwdriver.
The four lugs you can see are just simple lugs, no turning required.

 

[Burstnerite]

Thanks for the response. Ours isn't unlike yours, I'll give it another go.

 

[Burstnerite]

Yup, a modicum of violence shifted it. Contents included a dead ladybird. Curious. Anyway, thanks for the support.