[bcab] Articles for the blind

Hi,

Does anyone know with AFB if you can just print out an envelope and write 
Articles for the blind on this, or do you have to use one of the stickers that 
RNIB sell in packs?

I have been doing the former for a while, and usually get stuff through, but 
lately have had stuff returned as not qualifying (mainly CDS which are 
specificly for VI people and contain VI specific content).

Thanks.
Andrew.

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