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Safa and Marwa were born joined at the skull and they had never been able to see each other's faces.

The hospital has separated more than 30 sets of conjoined twins, including this year Safa and Marwa Ullah from Pakistan, who were joined at the head.

On Monday, the hospital announced that the twins, Safa and Marwa Ullah, had been successfully separated after more than 50 hours in surgery since October and thanks to the work of a team of 100.

Safa and Marwa Ullah’s condition was extremely rare.

Great Ormond Street Hospital has a specialist operating theater for surgery on conjoined twins, and the series of operations on Safa and Marwa Ullah were supported by a team of scientists and designers.