PDFs are really poor for accessibility. If people are reading information online, there is no reason to provide it in a PDF, because it's far easier to read that information on a web page. We therefore avoid using them and put the information in a web page wherever possible.
The only exception is if someone is likely to read the document as a print-out.
When linking to a PDF, ensure users are aware it's a PDF by including the PDF symbol:
You no longer need to state the size of the PDF.
% not per cent or percent
(even though we know it's wrong)
break up phone numbers like this:
020 7856 123
01653 618 657
If a company has a set way of writing their number, use that
power of attorney
lasting power of attorney (LPA), enduring power of attorney (EPA)
capitalise, eg Staying Sharp, One Digital