Why does the pound to rupee rate keep changing?

The pound to rupee rate keeps changing because it is a price set by supply and demand in the global currency market, where trading continues all day. Interest rate expectations, inflation, economic data releases, capital flows and general sentiment can all move it, sometimes within minutes. Even without news, steady trading makes the rate tick up and down. This is why a quote captured in the morning may not match one taken in the evening, and why quotes should be compared at the same moment.¹