Changing rooms open but no showers?

Is that not the same hot water that we're using to wash our hands?

The earliest we can get the boiler fired up and tested, is tomorrow. The earliest we can get the samples to be tested is Tuesday. The earliest they can give us our results, depending on the two tests, is 10 working days. The other (Legionella analysis) is 15 working days. If all is OK then that is fine, if they find traces, etc. longer. The Legionella need 10 days just to grow. That is the science. So the short answer is no.
I hope that answers your questions.