Noticed this thread while working on my Bangladesh page.
The first issues for Bangladesh are quite an interesting subject.

The Format International Security Printers printed the issue under direction of a E.E. Oatway by request from John Stonehouse who was a previous postmaster general for Great Britain.
To answer SaveBigBlue's questions.
1.) All of them and there are many of them. Exact quantity will never be known. Two types of the overprint exist. One is 12mm height of the letters and one is 13mm height. The 12mm height was accepted on the 10p, 5r and 10r stamps simply because Mr. Stonehouse delivered those in Dacca on December 20, 1971. He only had a few panes at the time. The other values were shipped in a large shipment later but were never validated.
My theory being that the other five values were not validated because only the 1st issue and the 3 values Mr. Stonehouse brought were all that
could be validated as the issues were immediately placed on sale in Dacca on that same day, the 20th of December.
Odd circumstances of British and American stamp dealers already selling them before their arrival in Bangladesh were another factor.
As for the 13mm overprints they were most likely a second overprinting with a purposeful slight variance to avoid legal actions against the agent E.E. Oatway.
None of the 13mm type were ever sent to Bangladesh. They were made because the 12mm ones sold out in a hurry on the worldwide market.
2.)Question answered above. Only a few panes (said to be 10) were delivered on December 20 by Mr. Stonehouse in person because of the wartime situation. The rest shipped at a later date with the other five values. They were found several years later in the treasury. Covers dated 1974 were produced with all 8 values on them
in Chittigong only for philatelic reasons. Some of the stock of invalid values being used on them.
Some of the stock was used on the "unofficial" official FDC's. They were produced and "issued" by representatives of Bangladesh government in England. The FDC's with all eight values were never sanctioned by the government of Bangladesh. The "representatives" are unknown. Probably E.E. Oakway as he was the "official" agent representing Bangladesh at the time.
Indeed one of the many mysteries that surrounds the Format Printers.
