ATMs widely available; credit cards widely accepted.
Restaurants Around 10% in restaurants and teahouses with table service, 15% at smarter restaurants. Tips may be added to your bill as a 'service charge'. Not compulsory.
Pubs & Bars Not expected if you order drinks (or food) and pay at the bar; usually 10% if you order at the table and your meal is brought to you.
Taxis Usually 10%, or rounded up to the nearest pound, especially in London.