Andrea Gordon from the Care Quality Commission said:
"We were pleased to see some improvements had been made and it is important that these are now embedded and sustained.
"However, we also found the trust needed to carry out more work in relation to how it assesses and assures itself of the quality of its own service. In light of this CQC has issued a warning asking the trust to ensure improvements are made in relation to this.
"Our inspectors will be returning in the near future to check on whether this further work has been effectively completed."
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The most hotly-tipped date is July 13, following the Nato summit which the president is due to attend in Brussels on the previous days.