The letter sequence <our> is normally pronounced ɜː in GB in the words courteous, courtesy and their derivatives and in the word scourge.
There are also number of words containing the sequence <jour> where the GB vowel sound is normally ɜː. Here are some examples:
adjourn journal journalese journalism journalise journalist journalistic journey journeyman journo
Here are some words where ɜː is one of a number of possible pronunciations:
sojourn tourmaline tournament tournedos tourney tourniquet
The word bourbon is pronounced with ɜː if it is the name of an alcoholic drink and bourgeois has ɜː if it the name of a typeface.
This tip was prompted by a post on Petr Rösel’s blog, so thanks to him and to Barry Cusack.