Bashir visited Chad last weekend for a meeting of Sahel and Saharan African leaders.
British Foreign Minister for Africa Mark Simmonds expressed frustration that Bashir wasn't arrested by Chadian officials during the visit. Chad is a party to the Rome Statute that created the International Criminal Court.
The ICC in 2009 issued an arrest warrant for Bashir on war crimes charges related to the situation in Darfur.
"This will be the third time the government of Chad has failed to implement warrants issued by the ICC for war crimes, crimes against humanity and genocide," Simmonds said.
"We expect all states parties to the ICC to comply with their obligations and, indeed, all states should cooperate with ICC investigations as set out in relevant U.N. Security Council Resolution."
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