War Office Instruction 166 (1914) detailed the rates of pay for all ranks in the various arms of the British Armed Forces as of 1914.
I've listed the pay scales covering infantry only, but even within this limitation, you'll notice that Foot Guards were paid more than Line Infantry.
Lieutenant-Colonel 28s 0d
Major 16s 0d
Captain 12s 6d
Lieutenant 8s 6d
Second Lieutenant 7s 6d
Quartermaster 10s 0d
Foot Guards/Infantry of the Line
Sergeant-Major 5s 2d/5s 0d
Quartermaster-Sergeant 4s 2d/4s 0d
Company Sergeant-Major 4s 2d/4s 0d
Company Quartermaster-Sergeant 3s 8d/3s 6d
Colour-Sergeant 3s 8d/3s 6d
Sergeant 2s 6d/2s 4d
Corporal 1s 9d/1s 8d
Private 1s 1d/1s 0d
additional proficiency pay is payable if the soldier fulfils certain conditions as to service and qualification: rates 3d or 6d per day, according to proficiency.
I have been able to do some verification on these figures as they appear on several websites (Such as Tommy1418 and "Innovating in Combat") but I've not been able to find a digital image/copy of War Office Instruction 166 (1914) yet to fully check the figures.