As many of my readers know I served in the Royal Marines but I very rarely write about that and have certainly never written about current British military surveillance units but I think now is a good time with it being Armed Forces Day on June 27th 2026.
All of my writing is from either open-source information published by the Ministry of Defence or my own lived experiences. Nothing I will write about will be sensitive or jeopardise any current units.
Flow of the blog
The way I’m going to write this blog is fairly simple. I’m going to list all the current British military surveillance units and then expand with who they are, what they do and their distinctive personal roles with my own experiences dripped in.
I will only focus on military units so I won’t be talking about the Ministry of Intelligence (MI5 and MI6/SIS) with the common misconception those fall under military, which they don’t.
The order is in no way respective of who’s the best as their roles are all different but I will do it in a way that looks at who is more surveillance focused than others.
So, here’s the list of British military surveillance units who deploy and regularly operate in surveillance;
- Special Reconnaissance Regiment (SRR)
- The Defence Human Intelligence Unit (DHU)
- Royal Marines Surveillance and Reconnaissance Squadron (SRS)
- Pathfinders
- 148 Battery and 4/73 Sphinx Battery
Only SRR is considered as a Tier 1 special forces unit based out of Hereford wearing the coveted emerald grey beret and midnight blue stable belts but the others all require a rigorous selection process and specialist training to be part of.
Special Reconnaissance Regiment - SRR
SRR which is a British Army unit and open to all members of the British Military are based out of Hereford alongside the Special Air Service. They are the only British military surveillance unit who are Tier 1. They have their own, very hard selection process which lasts around 6 months and covers;
- Covert surveillance
- Advanced surveillance detection
- Blue light and defensive driving qualifications
- Extensive communication training
- Extensive small arms weapons training on dynamic 360° ranges with and in vehicles
Their selection process whilst being incredibly arduous and mentally taxing is normally told by serving members to be enjoyable.
Once that is finished, normally the new operators are in a probation type phase and deploy almost immediately. Historically to theatres like Northern Ireland and Afghanistan but at present it is not known where their current operational climate is held.
Their role is focused on target acquisition and intelligence gathering for SAS raids or police arrests and prosecution.
SRR work heavily with the police and their surveillance teams as well as MI5 and MI6. Often operators leave and get a job within those organisations. There is an MI5 secondment where an SRR operator moves over to London and works with MI5 solely for a year or two.
I have never worked directly with SRR as the unit however, I have worked alongside ex-SRR operators both on civilian surveillance operations and training exercises. Whilst they maintain their way of doing things which is very different to the normal civillian surveillance circuit they are extremely professional and capable with the only flaw of not being the best at getting physical product for clients (mostly video evidence).
The Defence Human Intelligence Unit - DHU
DHU again are tri-service (meaning anyone can apply to join the unit) and are predominately based out of MOD Chicksands – the home of British Military Intelligence but are not considered tier 1 special forces.
Unlike SRR, members are usually drafted there on successful completion of the course for a minimum of 2 years and maintain their respective cap badge. The way to identify DHU operators is the trident badge worn on their uniform.
How DHU differs from SRR though is that they are not focused on covert surveillance operationally and they build their intelligence via covert human sources known as a CHIS.
Basically think of an informant who reports intelligence to DHU.
DHU’s main role is to act as agent handlers to get as much intelligence as possible and coach their informant’s of the best way to do so.
Their training focuses on surveillance detection rather than direct surveillance but they do have an element of surveillance training. DHU is actually considered to be one of the most secretive British military units and not well known.
My only experience with DHU was on training courses with their operators and they explained a more boring side to intelligence building than anything else. No change from normal surveillance then!
Conventional Military Units
Now rather than explain all of the conventional British Military Surveillance Units I will list them and explain briefly how they deploy in surveillance roles.
Royal Marines Surveillance and Reconnaissance Squadron.
The Royal Navy’s surveillance arm which is mostly made up of Royal Marines mountain leaders (ML’s) is the eyes and ears for the Royal Marines and Royal Navy.
All who are within the unit have to complete the Mountain Leader 3’s course or above which used to be the Reconnaissance Operator’s course. Their primary role is as it says on the tin; surveillance and recce whereby the perform rural and urban observations, shoreline reconnaissance ready for beach landings.
I deployed with SRS to Afghanistan back in 2011 but then known as Brigade Reconnaissance Force (BRF) and we deployed on a varying set of taskings and missions with little contacts compared to the main fighting units.
Pathfinders
The British Army’s equivalent to SRS the Pathfinders who are very widely known and respected. Their course runs similar to the Royal Marines ML3’s course being 6 weeks long and focusing in soldiering and physicality.
We took over for them in the exact same role as BRF in 2011 whereby they performed surveillance missions alongside penetration into unoccupied areas as a means of testing enemy strengths ready for the main force of 2 and 3 Para to occupy.
Royal Artillery & Royal Navy – Sphinx Battery and 148 Battery
Operating at the highest levels as forward observers for close air, artillery and naval gun support these units are well known as the premier units for the Royal Artillery and Royal Navy. As I am aware they focus on getting into or close to enemy areas to target then with munitions rather than sending boots on the ground in.
Sphinx Battery’s selection is renowned for it’s difficulty in the Surveillance and Reconnaissance Patrols Course (SRPC) which is 18 weeks long and no joke.
These units often deploy and work closely with SAS and SBS to keep each other current on the best tactics and techniques in observing and intelligence gathering for strike options.
Finishing off
A lengthy and wordy blog this month but a different one that I enjoyed writing and researching for. As an ex-service member of the Royal Marines it fills me with great pride at the scope and amount of units we have deploying in surveillance roles for our defence.
If any of the members serving the units listed above notice anything wrong or out of date please reach out to me!
Thanks for reading, Dan.
