base currency 4512(1) (in COLL31) the currency specified: (a) in the instrument of incorporation of an ICVC as the currency in which its accounts are to be prepared; or (b) in the trust deed of an AUT as the base currency of the AUT. (2) (in3891 GENPRU and BIPRU23) (in relation to 23a firm23) the currency in which that23 firm's 23 books of account are drawn up.