Currency & denominations
The pound (GBP) has 100 pence, with notes of £5, £10, £20 and £50, all now polymer. Coins include 1p, 2p, 5p, 10p, 20p, 50p, £1 and £2. Scottish and Northern Irish banks issue their own valid notes; they're legal currency but occasionally refused by uninformed retailers in England, so spend them locally if possible.
Cash vs card
Contactless cards and phones are accepted virtually everywhere, including buses, the Tube and small shops, and many places are effectively cashless. London transport in particular works best by simply tapping a contactless card or phone. Cash is rarely essential, though a little is handy for markets, some pubs and small independents.
Where to get the best exchange rates
City-centre exchange shops in places like London can offer good rates, especially competitive ones away from prime tourist spots. Compare advertised rates and check for commission, as the headline number isn't always the whole story. Often the easiest value is to skip cash exchange and pay by card or withdraw from an ATM.
Avoid the airport exchange trap
Exchange desks at Heathrow, Gatwick and other UK airports are notorious for poor rates and have some of the widest margins around. Avoid changing meaningful amounts there; if you need cash, use an in-terminal bank ATM instead. Better still, rely on contactless and skip airport exchange altogether.
Using ATMs
ATMs (cashpoints) are common, and machines run by major banks are typically free to use. Avoid independent ATMs that display a usage charge, often found in convenience stores. Always decline the machine's offer to convert to your home currency and choose to be charged in pounds.
Tipping culture
Tipping is more modest than in the US. In restaurants, around 10-12.5% is customary, but many bills already add a 'discretionary service charge', so check before adding more. You don't tip at the bar in pubs, and tipping taxis is usually just rounding up the fare.
Common money pitfalls & scams
Watch for the optional service charge already on restaurant bills so you don't double-tip. Decline DCC at card terminals and ATMs to avoid inflated conversion. Use ATMs in well-lit, busy spots and be alert to distraction tactics at machines in tourist areas.
How much cash should you bring
You can comfortably travel with very little cash thanks to near-universal contactless acceptance. A small amount of pounds covers the rare cash-only pub, market stall or tip. Withdraw from a bank ATM if needed rather than exchanging large sums in advance.