Margaret Hodge, the chair of the Public Accounts Committee, told ITV News: "I understand why they are tempted to go down this route but they are wrong. They should not be engaging in aggressive tax avoidance.
"I have to say the people who benefit from this are the accountants who have set up this system and they are taking money out of the NHS, out of direct services...and pocketing it and that is tax payers' money."
Laura Kuenssberg: NHS Trusts in England accused of avoiding tax
More top news
Consumer prices have rocketed by 58% since 2003, with the UK industry paying the biggest bills in Europe.
Friday will be a much calmer day for many, with the weather set to remain dryer with sunny periods and much lighter winds than on Thursday.
Teachers and managers in particularly are putting in hundreds of hours of overtime free of charge.