SIR – Labour’s desire to have the NHS working seven days per week is of course admirable (“Operations and scans at weekend under Labour plan for 24-7 NHS”, report, December 18). Sadly, maintaining the use of expensive assets such as operating theatres, radiology and pathology services 24 hours a day is wholly unrealistic given the large number of human beings required to run the organisation. When I operate, whether it be a major joint reconstruction or a simpler procedure, there are often seven