Purple Line Ltd, a leading manufacturer of caravan and recreational vehicle accessories, is proud to announce its official membership with Secured by Design (SBD), the UK’s flagship police-backed initiative dedicated to reducing crime through high-quality, innovative security solutions.
This milestone recognises the strength and reliability of Purple Line’s Fullstop® Security range. The membership includes the market-leading Excalibur wheel lock for AL-KO receivers, Nemesis Plus motorhome wheel lock, Nemesis Ultra universal caravan wheel lock, and Saracen Gullwing hitch lock. All trusted by caravan, trailer and motorhome owners across the UK and beyond.

Police-preferred caravan and trailer security
Secured by Design is widely recognised as the official “police preferred specification” for security products. Operated by Police Crime Prevention Initiatives (Police CPI) and supported by UK police forces, the initiative focuses on preventing theft through proven, high-quality product design.
To achieve SBD membership, Purple Line’s Fullstop® Security range underwent rigorous independent testing to meet strict police-approved standards. This accreditation is the only official route to police recognition in the UK, reinforcing Purple Line’s position as a leader in caravan, trailer, and motorhome security.
Fullstop Security: Market-leading security solutions
The Fullstop® Security range has been engineered to deliver maximum protection without compromising ease of use, incorporating a proprietary blend of advanced composite materials specifically selected for their resistance to cutting, drilling and gas-freezing.
Granted with the SBD seal of approval are:
- Excalibur wheel clamp – High-visibility, heavy-duty protection for caravans and trailers
- Saracen Gullwing hitch lock – Advanced hitch security designed for modern coupling systems.
- Nemesis Plus wheel clamp – Compact, robust, and highly effective theft deterrent
- Nemesis Ultra wheel clamp – Premium security solution offering enhanced durability and resistance
Designed for real-world use, Fullstop products provide reliable protection whether vehicles are at home, in storage, or on-site, while remaining fast and simple to install.
Jonathan Harrison, Managing Director of Purple Line, commented:
“Achieving Secured by Design membership is a significant milestone for Purple Line and a testament to the strength of our Fullstop® Security range.
Our focus has always been on delivering products that combine high-level protection with genuine ease of use. Fullstop devices are designed to be intuitive, quick to fit, and rapidly deployed, giving customers effective security without complexity or delay.
The SBD police-backed recognition reinforces our commitment to innovation, quality, and industry-leading standards. As theft prevention becomes increasingly important for caravan and motorhome owners, we are proud to offer solutions that are not only highly effective but also simple and practical to use every day.”
Find out more at www.fullstop-security.com
Notes to Editors
- Secured by Design (SBD) is the official UK Police flagship initiative supporting the principles of designing out crime. SBD is owned by Police Crime Prevention Initiatives and works alongside police forces and industry partners.
- Purple Line Ltd is a leading manufacturer of accessories for caravans and recreational vehicles. Its diverse portfolio include caravan motor movers, security devices, lifting aids, and award-winning self-inflating camping trailers and tents
- Fullstop® Security delivers market-leading security solutions for caravans, trailers, motorhomes and more. Every product is designed and manufactured to offer maximum protection and user-friendly operation, using advanced materials engineered to withstand sophisticated theft attempts.
For media enquiries, please contact adam.hamilton@purpleline.co.uk