- The Territorial Force was set up on 1st April 1908, and all units previously entitled as Volunteers became Territorials. All infantry units, except in London, became Territorial Battalions of their parent regular Regiments.
- The County of London was formed in 1888, taking over parts of Surrey, Kent and most of Middlesex; and within this area there was no separately named regular London Regiment. Consequently a new territorial Regiment was formed – The London Regiment – and all the volunteer Battalions in London became territorial Battalions of this Regiment. Unlike the other volunteer Battalions, however, The London Regiment did not form part of the corps of any regular Regiment – it was the only wholly self-standing Territorial Force Regiment. The direct connection with the parent regular Regiment, which had lasted through the previous 25 years, ceased.
- The City of London did have a regular Regiment, The Royal Fusiliers, of which four City units had been volunteer Battalions. These four might have become territorial Battalions of The Royal Fusiliers. Instead, they were made Battalions of The London Regiment, leaving The Royal Fusiliers with no territorial Battalions.
- Originally, The London Regiment was scheduled to have 28 Battalions, including the Honourable Artillery Company infantry Battalion as the 26th , and 14th Middlesex (Inns of Court) Volunteer Rifle Corps as the 27th . This order was rescinded, and these two numbers were not used.
- The first eight Battalions became City of London Battalions, and the other eighteen County of London Battalions. Within these two groups the numbering was not based on the seniority of the original Rifle Volunteer Corps, nor on that of the Regiments of which they subsequently became volunteer Battalions.
- On its formation in 1908, The London Regiment stood as follows:
1st (City of London) Battalion, The London Regiment
2nd (City of London) Battalion, The London Regiment
3rd (City of London) Battalion, The London Regiment
4th (City of London) Battalion, The London Regiment
5th (City of London) Battalion, The London Regiment (London Rifle Brigade)
6th (City of London) Battalion, The London Regiment (City of London Rifles)
7th (City of London) Battalion, The London Regiment
8th (City of London) Battalion, The London Regiment (Post Office Rifles)
9th (County of London) Battalion, The London Regiment (Queen Victoria's)
10th (County of London) Battalion, The London Regiment (Paddington Rifles)
11th (County of London) Battalion, The London Regiment (Finsbury Rifles)
12th (County of London) Battalion, The London Regiment (The Rangers)
13th (County of London) Battalion, The London Regiment (Kensington)
14th (County of London) Battalion, The London Regiment (London Scottish)
15th (County of London) Battalion, The London Regiment (Prince of Wales's Own, Civil Service Rifles)
16th (County of London) Battalion, The London Regiment (Queen's Westminster Rifles)
17th (County of London) Battalion, The London Regiment (Poplar and Stepney Rifles)
18th (County of London) Battalion, The London Regiment (London Irish Rifles)
19th (County of London) Battalion, The London Regiment (St Pancras)
20th (County of London) Battalion, The London Regiment (Blackheath and Woolwich)
21st (County of London) Battalion, The London Regiment (First Surrey Rifles)
22nd (County of London) Battalion, The London Regiment (The Queen's)
23rd (County of London) Battalion, The London Regiment
24th (County of London) Battalion, The London Regiment (The Queen's)
25th (County of London) (Cyclist) Battalion, The London Regiment
28th (County of London) Battalion, The London Regiment (Artists Rifles) - The 10th (County of London) Battalion, The London Regiment (Paddington Rifles) was disbanded in 1912
- and replaced by the 10th (County of London) Battalion, The London Regiment (Hackney).
- In April 1908 the Territorial Force Yeomanry units administered by the City and County of London Territorial Forces Associations were as follows:
Cavalry Militia, Special Reserve:
The King's Colonials Imperial Yeomanry title changed in 1910 to: King Edward's Horse (The King's Overseas Dominions Regiment)
Yeomanry Territorial Force: (The Yeomanry precedence number follows the unit title)
1st County of London Yeomanry (Middlesex, Duke of Cambridge's Hussars) 27
The City of London Yeomanry (The Rough Riders) 46
2nd County of London Yeomanry (The Westminster Dragoons) 47
3rd County of London Yeomanry (The Sharpshooters) 48
The Territorial Force and The London Regiment 1908