martin
Is a question I here a lot and if its all wired correctly then its almost sure to be a misaligned skirt, the main part that holds the light bulb. Have a look at this and you will see what is needed when you assemble a BC unswitched lampholder.

http://www.lampspares.co.uk/lining-up-an-unswitched-lampholder/
Lampholder-line-up.jpg 
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