In particular cases where 00 is a valid check digit, 97 will not be a valid check digit, likewise if 01 is a valid check digit, 98 will not be a valid check digit, similarly with 02 and 99.
The EISCD is updated weekly, and is available on a subscription basis from VocaLink. Sorting code and BIC allocation
Members have ranges of sorting codes that they can allocate to bank offices. Each record on the ISCD has 82 fields. Although there is a strong correlation between BIC Codes and sort codes, sort codes are not explicitly encoded into BIC codes (although they are encoded into IBANs).