Wesfarmers has cashed in its major investment in financial services, which is in insurance, but has opted to retain its premium funding business.Insurance Australia Group is the buyer of Wesfarmers Insurance, including Lumley and OAMPS.Wesfarmers offered no rationale for its choice in retaining the premium funding business, which used to trade as Lumley Finance.Public domain data on Wesfarmers' premium funding business is scant. The Wesfarmers annual report merely observes that "the business continued to perform strongly and profitably".It's interesting to wonder what connection the decision to retain its lending business has to a mooted project at Wesfarmers to seek a banking authority for its Coles supermarket brand.Wesfarmers won't engage in the long running speculation about this project, which is being driven by Richard Wormald, the general manager of financial services at Coles.