Name an English city that contains a double letter.?

Morocco (CC), Cameroon (OO), Greece and Greenland (EE) Andorra and Sierra Leone (RR), St. Kitts and Nevis (TT) Russia and Belarus(former name)/Byelorussia (SS), the Caribbean Sea (BB), Addis Ababa, Ethiopia (DD), Amman, Jordan (MM) and Seychelles (LL).