material interest

3(in COB ) (in relation to a transaction) any interest of a material nature, other than:

1. (a) disclosable commission on the transaction;
2. (b) goods or services which can reasonably be expected to assist in carrying on designated investment business with or for clients and which are provided or to be provided 29 in compliance with COB 7.18.3 R (Use of dealing commission to purchase goods or services)29