BANGKOK: Thailand’s billionaire former leader Thaksin Shinawatra was hospitalised on his first night in prison after his historic return from self-exile, officials said on Wednesday, citing concern about his heart and blood pressure. The influential founder of Thailand’s populist Pheu Thai Party was transferred to a police hospital overnight, 15 hours after a vaunted homecoming from 15 years abroad to avoid jail, that coincided with his political ally being elected prime minister in a parliamentary vote. The corrections department said the Thaksin was hospitalised after being unable to sleep and experiencing chest tightness and high blood pressure.