Credit Unions vs Banks
Most banks don't give much unsecured credit, except through Credit cards to non-customers. Most Overdrafts for example are bolted into expensive Current accounts, and customers can also get very poor deposit rates. There's also no interest on C/A credit balances worth talking about.
The point is, taking daltonr's line that if CU's were required my IFSRA to recalculate APR, even allowing for interest rate rebates, ( which seems impossible) surely it would also knacker bank advertising too?