Well - I found him pretty quickly! As you're interested in Cheshire and Staffordshire research I checked the first regiment I came across that was as local as possible, which was the 8th Foot (Liverpool, or The King's, regiment).
Private Edwin Chesters, no.1818, Afghan War medal, no clasps, 8th Foot.
The 8th were involved at the Peiwar Kotal battle (2 Dec 1878), but as Edwin has no clasp for that he must have missed it. He may have been part of the 2 companies under Captain Lewis that stayed behind to garrison Kohat. These 2 companies joined the rest of the regiment in the second campaign, after September 1879, in various works and holding the position at the Peiwar Kotal - including some minor actions against Mangals and Jagis. They returned to India in October 1880 when the Kurram Valley was evacuated. In the kurram Valley the regiment had suffered quite a bit of illness (usually cholera).
Hope this leads you to find out more.
Best -
Garen.