This question follows neatly from the codicil discussion.
In particular, where there are markings on a will, that might indicate something else has been attached to the will, then the law creates a number of obligations to investigate this potential issue.
For example, it could be assumed that a paperclip may have attached a codicil to a will.
Obviously, in many instances, the paperclip will in fact have only attached, say, a 'with compliments' slip.
This therefore can create a significant amount of wasted resources, hence our very strong recommendation that nothing be attached in any way, shape or form to a will (or codicil).
** For the trainspotters, the title of the post today is riffed from a line from The Foo Fighters song ‘This is a call’ from 1995.