Jerry Petherick, managing director for G4S Custodial and Detention Services, said: "The mobilisation of any prison is a complex and challenging operation but the size and scale of Oakwood - the largest prison in the country - made this even more acute.
"As well as the logistical hurdles in new establishments, prisoners test the regime as well as the members of staff, who may be new to prison life.
"We have already taken steps to make improvements, appointing a dedicated task-force to address problem areas, such as the prevalence of drugs, while providing additional funding where necessary. This is starting to yield results."
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An investigation is underway after a five-year-old boy died following an incident at Bosworth Water Park.
A dry start, with sunny spells developing. However turning cloudier again later, with showers possible by the evening.
After a fine evening with some late sunshine to the end the day, a largely dry and fairly warm night will follow with clear spells.