Bosnia has demanded an apology from Britain for "mistreating" its former president in prison.

Ejup Ganic, 64, was arrested at Heathrow on March 1 and held in Wandsworth prison until he was granted bail at the High Court on Thursday.

Dr Haris Silajdzic, the chairman of the joint presidency of Bosnia-Herzegovina, said he was "shocked" by Dr Ganic's claims he was denied consular assistance, access to a telephone and his medication for three days.

He said Foreign Secretary David Miliband had promised to investigate the complaint.

Dr Silajdzic said he had met Mr Miliband earlier to discuss Dr Ganic, who faces accusations by Serbia of war crimes, saying: "He didn't have for three full days access to the telephone and he had problems even with his medicine that he takes usually for treating high blood pressure."

This was a "clear contravention" of European conventions, Dr Silajdzic said, adding: "I said that I believe that an apology is owed so that Bosnia-Herzegovina will know that our relations are normal, that this was an aberration of otherwise good and friendly relations with this country."