From their website:
The company has no plans for any restrictions to customers water use over the summer. Overall the companies reservoirs are 93% full -
And why?
"The company has been taking action for months to conserve water stocks ..."
"... has the lowest leakage rate in the company's history"
transfers "large volumes of water from the River Severn" as it goes past Sharpness to the sea it is partially diverted into the Gloucester-Sharpness Canal. (No use to anyone else at that point.)