Here are some links to web pages that may be of interest to you.

Engineering/Surveying websites

• engineeringsurveyor.com - Resources for the site engineer
• Become a Surveyor! - The Survey Association
• Ordnance Survey - Britains mapping agency

Surveying companies (UK)

• Arthur Hudson Site Engineers - Steel Erection/Construction Site Engineers
• AJB Setting-out - Civil and Site Engineering

Products and Equipment

• TagBlue - Precision reflective targets

Professional bodies

• Chartered Institution of Civil Engineering Surveyors

UAV organisations

• Civil Aviation Authority (UK) - Guidance on Unmanned Aerial Vehicles (UAVs)
• Euro-USC - UAV accreditation specialists
• ARPAS UK - Non-profit trade organisation
• DroneList - Free and easy way to find UK registered operators