About us

Nocturne is run by husband and wife team Catriona and Nigel, who bring vast experience and qualified knowledge to their survey work

Established in 2001 by Catriona, Nocturne Environmental Surveyors Limited was set up to specialise in commercial bat and bird surveys. Nigel later joined the business adding valuable experience as an ecologist and licensed bird ringer.

Experience guaranteed

Training includes Bat Worker Training at Kindrogan Field Centre and Bat Survey for Consultants at Bristol University, whilst assisting the training of volunteers within the Clyde Bat Group. With many years experience of dealing with bats and their habitats Nocturne holds a Roost Visitor and Hibernation Visitor licence. They also maintain their rabies inoculations.

The company has public indemnity and liability insurance for its activities.

Catriona Scriven


With an HND in Countryside Recreation & Conservation Management from Auchincruive College in Ayr, Catriona's first taste of bat survey training was a Scottish Natural Heritage course at Kindrogan. Hands-on experience as a bat worker followed with five years working for Scottish Natural Heritage (SNH). During this time, she has continued her volunteer work for the Bat Conservation Trust's National Bat Monitoring Programme, along with membership of the Clyde Bat Group.

Additional training has been with University of Bristol - Bat surveying for ecological consultants held at Woodchester Mansion. Also with CIEEM  a course on Bat mitigation training.

Catriona has maintained an Scottish Natural Heritage (SNH) bat roost licence for more than 20 years. She also holds a Natural England Class bat licence, She's a participating member of the Chartered Institute of Ecology & Environmental Management (CIEEM).

Nigel Scriven
BSc, CBiol, MRSB


During his BSc in biology at Exeter University, his studies included heathland ecology, small mammal ecology and a research project on Sika Deer on Lundy Island. Following this he spent two years at North East London Polytechnic researching Wood Mice ecology in Essex, and completed a Post-graduate Diploma in Biometry. After teacher training at Bangor University, he worked in outdoor education and environmental fieldwork for 28 years, in Argyll and Renfrewshire.

Since 2008 he has been undertaking freelance ecological survey work, mainly on birds and bats, but also other species and habitats. The bat surveys have involved buildings, trees, commercial, industrial, municipal, and rural sites, as well as taking part as a volunteer in the National Bat Monitoring Programme.

Nigel has participated in CIEEM training for badgers & bats. His survey experience has included numerous volunteer surveys for the British Trust for Ornithology, as well as for wind turbine and micro-hydro schemes. A licensed bird ringer and member of Clyde Ringing Group, he was a founder member of Argyll Bird Club, and has served on its committee since inauguration (1985), with three periods as Chairman.

Nigel is a member of the Royal Society of Biology and is a Chartered Biologist.