So, for the convenience of everyone here, (especially the British militaria collectors) I researched and uploaded images of all known TRFs used by the British Army today. Some units such as SAS do not have TRFs.
Note -- most of these were drawn in paint, since they are fairly simple. However; some of the more intricate flashes are super-sized images of that TRF that has been blown up from a thumbnail, so the resolution may not be perfect, but should provide a clear enough picture to help determine the identity of said TRF.
The following units had no information available, meaning they either do not have a TRF, or a current TRF was not found at the time of this posting.
Units without TRF: Royal Army Chaplains Corps, Army Physical Training Corps, Small Arms School Corps, Corps of Army Music, General Service Corps, Intelligence Corps, Army Air Corps (as a whole, excluding shown 9th Regiment TRF) and the SAS.
This list is as complete as my own research could make it, but there are bound to be units I may have overlooked, and it is probably by no means 110% complete, so if you have or know of a TRF not listed here, by all means please add it!

Household Cavalry

The Blues and Royals and The Life Guards
Royal Armoured Corps -- Heavy Cavalry

Queen's Dragoon Guards

Royal Scots Dragoon Guards

Royal Dragoon Guards
Royal Armoured Corps -- Light Cavalry

Queen's Royal Hussars

9th/12th Lancers

King's Royal Hussars

Light Dragoons

Queen's Royal Lancers
The Royal Tank Regiment

1st & 2nd Royal Tank Regt
Royal Armoured Corps -- The Yeomanry

Royal Yeomanry

Queen's Own Yeomanry

Royal Mercian & Lancastrian Yeomanry

Royal Wessex Yeomanry
Infantry -- Foot Guards

Grenadier Guards, Coldstream Guards, Scots Guards, Irish Guards and Welsh Guards
Infantry -- Line Infantry & Rifles

Royal Regiment of Scotland

Princess of Wales's Regiment

Duke of Lancaster's Regiment

Royal Regiment of Fusiliers

1st Battalion, Royal Anglian Regiment

2nd Battalion, Royal Anglian Regiment

3rd Battalion, Royal Anglian Regiment

Yorkshire Regiment

Royal Welsh

Mercian Regiment

Royal Irish

1st Battalion, The Parachute Regiment

2nd Battalion, The Parachute Regiment

3rd Battalion, The Parachute Regiment

4th Battalion, The Parachute Regiment

Royal Ghurka Rifles

The Rifles
Support & Services

Royal Artillery

Royal Engineers

Royal Signal Corps (this is a two-colour patch, white and blue, I simply forgot to do an outline)

Royal Army Dental Corps

Royal Army Medical Corps

Royal Army Veterinary Corps

Royal Logistic Corps

Royal Electrical and Mechanical Engineers

Adjutant General's Corps (SPS Branch shown for example, other flashes are issued for neccessary branch, ie. MPGS, ETS, ALS)

Queen Alexandra's Royal Army Nursing Corps
Other Branches of the Armed Forces

Royal Air Force

Royal Navy
Miscellaneous TRF's

Pathfinder Platoon

13 Air Assault Regiment, Royal Logistic Corps

7 Air Assault Battalion, Royal Electrical and Mechanical Engineers

9th Regiment, Army Air Corps (again, another two-colour patch without an outline)
Last edited by Camo_fiend on Fri Mar 19, 2010 1:43 pm; edited 3 times in total