I've just been trying with my mum's old 1058 oven. The bulb cover is very stiff - other forum posts have mentioned trying to shift with a hammer and wooden spoon!
No luck as yet, will try again when not about to go out for lunch!
Tim, March 2012
Depends on model if round glass in roof corner or middle will unscrew may be very tight special tool available or can use car oil filter removal tool.If light in side wall glass will prize off dont disturb chrome part. In all cases bulb will unscrew.