The EDIPI is a ten-digit number located in the barcode on the back of the card and in the integrated circuit chip embedded in the card itself. The first 9 digits are assigned unique numbers with the 10th digit being a check digit for the identifier. The EDIPI can be used as a unique person identifier.
In a British infantry battalion there are 3 rifle companies, 1 support company, 1 HQ company. Each rifle company is split into 3 platoons, and a HQ element. Each platoon is then split into 3 Sections of 8 men. Thee platoon is led by the platoon commander which is normally a 2nd lieutenant or lieutenant and a platoon sergeant.
There are 4 brigades in a division. Each brigade has 6 battalions in it (2 infantry battalions, 1 artillery battalion, 1 BSB, 1 BSTB, and 1 Cavalry battalion) so to answer your question in a standard division there are 24 battalions. There are 4 brigades in a division.