Yes, and they do. As I mentioned in an intervention on the hon. Member for Cardiff West (Kevin Brennan), some councils make a surplus from it that goes towards their services.
As has been pointed out, clause 14 singles out union subscriptions. There is no prohibition on other deductions for which there might not be compensation to the employer, such as deductions for season tickets, which have been mentioned, or professional fees. Even on my payslip as a Member of Parliament, the top deduction every month is £2 for the Members fund. There will be no prohibition on that deduction, unless the Members fund is a national union of Members of Parliament, which I do not think it is.
Other people have made the case much more eloquently than I have, so I will not detain the House any longer on this point.