Tim,
Recently, I had a look at "Soldiers Died" for the 17th Manchesters, prompted by your mention of the Royal Berkshires of which there are a number listed under the 17th Manchesters' name
and I came across the following Warrant Officers: -
44694 CSM Harry Brindley MM, formerly 13954 Royal Fus. Kia 22.3.18 Savy British Cemetery.
12555 CSM Wm. Dickinson (recorded as Dickenson) formerly 5205 Lancs. Fus. Kia 30.4.18 Tyne Cot Memorial.
I was intrigued to learn whether or not the warrant officer rank was held prior to their transfer to the Manchesters, and in the case of CSM Brindley, with which regiment did he win the MM.
Can you help, please? PhilipG.