@cicerone imposter,
Most credit cards, mortgages are set using the base rate that has been set by the respective central banks.
LIBOR is used by banks to lend to *each other*.
Sometimes, the cost of funds determined by LIBOR may affect the rate at which banks are willing to lend short term, but they are for very large corporate financing.
In any case, the scale of consumer mortgages, credit cards etc is so low that LIBOR movements does not affect it much at all.
LIBOR changes very frequently, sometimes every day. Base rate changes less frequently. That is why whenever there is a base rate change, mortgages etc get affected.