Site access management.

Delivering Excellence

Ensuring our estate is managed efficiently and securely is always a priority. Innovation is one of our core values and we constantly look for improvement in all that we do. In partnership with Locken, Cornerstone has a digital mobile application which is used to activate a Locken key to access all of our sites.

This latest generation digital solution provides:

  • Super secure access - all visits will be logged through the digital system for activities such as Health and Safety or site maintenance
  • Real time reporting and tracking of who has visited our sites
  • The ability to remove redundant, lost and stolen keys from our estate, enhancing security.

The app has a number of other important benefits and is good for:

  • Our customers - further peace of mind that their networks and equipment is protected through our digital access control
  • Our landlords - only authorised individuals will be allowed access to our sites
  • Reduced carbon footprint - through fewer journeys by improved management of who goes out and when to our sites.

Please see below for our supporting resources to help our suppliers, customers and our customer's suppliers, use and get the most out of the Cornerstone Locken app.

Andrew Alexander
Head of Operations

Training videos.

How to create an accountWatch

How to login into the App and get validatedWatch

How to book a NOWWatch

How to use the My NOW screenWatch

User guide.

MyLocken App User GuideView


Access & Conduct policyView

If you have any issues or need more information please contact the Locken Support Team on 0203 608 0232 or email

Contact us

Hive 2
1530 Arlington Business Park
Contact Cornerstone

Site Reporting

To report a site issue click here.

London Site Audit

To request site access or cancel a visit click here.