main santander branches will have a different style of cash machines inside that allow you to pay single cheques or cash etc in at a time (looks more like a computer style one) these were originally ment for business customers when they made the change to not allowing them to use the kiosks...
in general if they are not in the machine by 2-3pm they will not be processed, its a pain and does take an extra day but they dont charge for any transactions. Well they at least dont on my account
