I probably echo comments below however..
Working with the mains unplugged and from the rear of the microwave, remove the top two Phillips (PH2) screws.
Still working from the rear of the microwave, remove the two Torx (CR-VT-15) screws. These Torx screws have a tamper proof security pin built into the head. I had previously purchased a set of tamper proof security bits to fit this type of head (from a popular on-line auction site for about £5) but, with care, you could use a good pair of long nose pliers for the same result.
Next remove the remaining Phillips (PH2) screw from the left hand side of the unit and, again working from the rear of the microwave, holding each side under the side flaps, carefully slide the lid/sides back towards you. It is held in position around the front microwave frame with a long pinch clip - Much like a PC lid if you have ever removed one of those.
A word of warning, with all FIVE screws removed, the lid "will" slide back - Any un-necessary force will result in a ugly crease in your shiny stainless steel cover!!
You will find the "SES E14 20watt, 240volt, 300 degrees C" OVEN bulb on the left hand side top of the microwave. It is held up side down in a black bulb holder. The bulb can be unscrewed/removed as is or, for easy access, by carefully prying the two plastic clips which keep the black bulb holder in place.
Remember, you'll need a SES E14 20watt, 240volt, 300 degrees C oven bulb - A standard bulb will not stand the oven heat.
Martine - Cardiff, July 2009