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Check out MichelleLM's message #573 (page 29 on this thread) part replicated here-
snip > You remember the good old days when they could only take money back off you at a rate of 4 days' gross at a time? Well, if you're not already aware, that's all changed.
You can now have up to 50% of your gross monthly pay (minus Income tax, NI Maternity Pay, Statutory Adoption Pay and Statutory Maternity Pay) taken off you in one lump. See a a little beauty of a publication called JSP 754 Ch2 Sec 4 for more details. <snip
Another stealthy change brought in when nobody was looking!