SWIMMING instructors have apologised after an issue with a pool led to last minute cancellations.

Keep On Swimming, which offers lessons in and around Colchester, had to cancel after a chemical imbalance in its pool meant it was written off for the day.

A spokesperson for the group said: “Lessons cancelled due to a chemical imbalance in the pool, we have tried to contact everyone.

“Huge apologies for the short notice.”

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