I don't think anyone would be surprised that a bank can't necessarily let you withdraw arbitrarily large amounts of cash from any given branch at any time. On

I don't think anyone would be surprised that a bank can't necessarily let you withdraw arbitrarily large amounts of cash from any given branch at any time. On the other hand, 1500 pounds doesn't seem like much. The largest amount I've ever personally withdrawn in cash was about eight thousand dollars, and they needed to check they could handle it, but did so without complaining.