Up to 4,000 homes are without water after a main burst outside the Royal Berkshire Hospital in Reading. The hospital was largely unaffected.
Thousands of schools remain shut, with warnings that some exam candidates could have to wait five months to sit GCSE and A-level modules in England, Wales and Northern Ireland if weather prevents them taking them next week.
Exams watchdog Ofqual said in cases where candidates would not have a second chance to sit papers in the summer, applications could be made for "special consideration".