When looking for gel highlighters, look no further than the highly rated Mr. Pen gel highlighters, which have an overall rating of 4.8 stars, after more than 25,000 reviews.

The pens can deliver either a 1.6mm or 3.3mm line depending on how you use the highlighter. Buy now £8.50, Cult Pens Faber-Castell Textliner 46 Desk Set of 24 ...

Ballpoint pens play nice with Mildliners, but be forewarned that gel pens (such as the Pentel EnerGel RTX, Uni-ball Signo RT1, Pilot G-2, and Zebra Sarasa, shown here) will smear. Maria Adelmann ...