About the USD to GBP rate
GBP/USD, nicknamed "cable" in trading circles after the transatlantic cable that once carried its quotes, has a reputation for sharper swings than EUR/USD, particularly around Bank of England rate decisions and UK economic data.
If you're sending money to or from the UK, the spread between this mid-market rate and what a bank or transfer app actually offers you is worth checking every time — UK-bound transfers from the US are a high-volume corridor, and providers compete hard on price for exactly that reason, so shopping around tends to pay off.
Property buyers and pension transfers between the US and UK are particularly sensitive to this rate, since the amounts involved are large enough that even a half-percent difference in the rate offered can mean a meaningful sum either way.