My dome light bulb has failed, would welcome some advice on removal of the housing to replace it, my housing incorporates the fold down glasses case, and inside this there is a torx screw? i think it may be a festoon type bulb?

Remove the screw you've already discovered.

Then, with your fingertips or a SOFT plastic tool, ease the front of the housing downwards. It will probably be very stiff and may take a fair bit of grunt but please don't use a hard tool as it will damage the edge of the housing.

Keep an eye on the local headlining in  case it rips.

 

Many thanks for that advice, i will try it in the morning, best regards, Mike