Did your FEO not discuss this with you when you had your visit ?
The usual line of questioning is "how much BP will YOU want to hold" followed by "where will you hold it" followed by "can I see your storage arrangements" .. unless at the tim .......you told him you were only shooting 777 - in which case he wouldn't have asked any of that !
Roy
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See the attached link from the ssbpcrc - tells you all you need ....
http://www.ssbpcrc.co.uk/Faq.htm