QUOTE(pandy @ Oct 13 2019, 09:31 AM)
It sounds like a character encoding mismatch. It happens if a document for example is saved as ANSI but served as UTF-8 or vice versa. A little mysterious though since £ is among the safe characters that are encoded the same in both character sets.
Could it be a problem with a document that uses an 8-bit encoding being served with a 16-bit encoding, or vice versa?