Hi Greg, on the whole the code works as it should and I'm really grateful for your time - the only issue is that where there is a period followed by a space (see 1.2 and 1.3.1 in the first image), the code is adding an additional period but is removing the space (see second image).

Before code is run
Manual numbering should be separated by periods and no spaces inbetween.
Before.JPG

After the code has run
Where there is a period followed by a space (see 1.2 and 1.3.1 in first image), the code adds an additional period but does remove the space.
After.JPG

This is what the text should look like when the code has run, no double periods.
What it should look like.jpg