One of the UK's leading security providers

Providing a safe & secure future to UK infrastructure

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Providing a safe & secure
future to UK infrastructure

RS4 Security Ltd are a UK Private Security Company specialising in the physical protection of the UK’s Critical National Infrastructure.

Those critical elements of national infrastructure facilities, systems, sites, information, people, networks and processes, the loss or compromise of which would result in major detrimental impact on the availability, delivery or integrity of essential services, leading to severe economic or social consequences or to loss of life.

RS4 Security onsite RS4 Security onsite 2

See for yourself

What RS4 Security is all about.

Why Choose Us?

Why RS4 Security is your only choice

We always put in the hours

We have a truly unique capability to protect Renewable energy projects across the UK. We have helped developed the industry from its conception and have developed a unique method of operations delivering of over 250,000 hours of security into the market to date.


We are members of the Railtrack Industry Supplier Scheme and Sentinel sponsors, allowing us to deliver our unique method of operations in protection of our country's fastest growing transport networks.


  • Flexibility

  • Integrity

  • Serving our served

RS4 Security has a strong set of values adopted by all its partners and staff.

RS4 offering support and help using our strong set of values

Did you know?

RS4 Security has delivered over 250,000 hours of security into the market to date.

Layers of Protection

Front Line Services

Front Line Protection - RS4 Security
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Non Front Line Services

Non Front Line Protection - RS4 Security
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what people are saying


Our reputation speaks for itself


Just a short note to thank you for the excellent security services you provided at Lilbourne Windfarm.

Despite several unauthorised incursions on to site we had no thefts, damage to plant or equipment and no breaches of high security areas which at times containing extremely valuable items.

I was particularly impressed with the level of training, professionalism and qualifications exhibited by your staff.

I would readily recommend RS4 Security for future projects.

RG Carters

Just a note to confirm how impressed I have been with the quality of the security that you have provided.

It has far exceeded what I expected you to provide and every man that has worked here has been a pleasure to work with. Everything has been handled with great professionalism so I look forward to working with you again.


RS4 have just completed work for Senvion at Clashindarroch, they were professional and provided a reliable security service.

I will be using their services again on the next project.

Corporate Covenant

RS4 Security will endeavour in our business dealings to uphold the key principles of the Armed Forces Covenant, which are:

  • No member of the Armed Forces should face disadvantage in the provision of public and commercial services compared to any other citizen

  • In some circumstances special treatment may be appropriate especially for the injured or bereaved

RS4 Security recognises the value serving personnel, reservists, veterans and military families bring to our business. We will seek to uphold the principles of the Armed Forces Covenant, by:

  • Promoting the fact that we are an armed forces-friendly organisation

  • Seeking to support the employment of veterans young and old

  • Seeking to support our employees who choose to be members of the Reserve forces, including accommodating their training and deployment where possible
RS4 Silver Award of the Armed Forces Covenant