Battle patches of the 166th Brigade, 55th (West Lancashire) Division in the First World War, 1917 onward, (l-r, t-b) 1/5th King's Own Regiment, 1/10th King's (Liverpool) Regiment, 1/5th South Lancashire, 1/5th Loyal (North Lancashire) Regiment, 166th Machine Gun Company (a simplified crossed machine guns of the Machine Gun Corps badge), 166th Trench Mortar Battery (a stylised trench mortar bomb).
Coop, J. O. (1919)       The Story of the 55th (West Lancashire) Division, Liverpool:  Liverpool Daily Post Retrieved on 3 September 2019.
Original: British Army Vector:  Usedtoknowthat