vaste bewapening Bristol Blenheim Mk.1(F)

Ook elders gevraagd, maar ik hoop dat iemand het hier wellicht weet:

Can anyone confirm;
1. How was the ammunition feed arranged for the fixed winggun?
2. How many rounds were held for the winggun?

3. How was the feed arranged for the gunpack?
4. Was the ammunition drum situated in the bombbay?

Also, I noticed that Finnish Blenheims had small bombbays fitted in the wingroots. Was this common to all Mk.1's? I noticed that there was a small external bombrack fitted aft of the internal bombbay.