EUR/GBP is the most watched European cross-rate, used by companies trading across the Channel and by traders expressing a view on the Bank of England against the European Central Bank without a dollar leg.
It moves in a narrower range than the dollar pairs, because the two economies share shocks. A common tactic is to watch cable and fiber for the dollar's direction and the chunnel for the genuinely European story.
Example: EUR/GBP moves from 0.8490 to 0.8540, 50 pips. On one standard-lot that is GBP 500, roughly USD 635 at GBP/USD 1.2700. See pip-value-cross-pair.
Related: cross-rate, euro-cross, cable, pip-value-cross-pair