Hi
Suggest you send a personal message to mack (global moderator).
He helped me with research about my grandad, 44510 A-CPL Stanley Gilbert Gordon Vince who I now know was in the Manc. Regiment 20th Bn., (5th PALS). He was able to send me a list of reinforcements (numbered & named above & below my grandads details) who became Manchester Regiment soldiers in 1916 - presumably to bring the Regiment back to strength after their losses at the battle of Fricourt in July 1916 on the Somme.
My grandad was in the Royal Fusiliers (City of London Regiment) before becoming a Manchester soldier & I assume that the reinforcements with him on the list from mack were all probably 'London lads' either residents or workers like him in the City. My grandad went overseas with the Manchester Regiment & was then put into the 20th Bn. He was in the field in October 1916 & I am still trying to find out more about his theatre of war after this date.
Good luck