From the Bat Conservation Trust website:
The Bat Conservation Trust encourages people working with bats, or those who might come into contact with bats or their roosts during their daily lives, to follow good practice.
We have worked with organisations and individuals across many sectors to develop a range of guidance to help you conduct your business or perform your work with consideration for bats.
Following feedback from experts in the field and authored by professionals, the Bat Conservation Trust has updated and revised the “Bat Surveys: Good Practice Guidelines“. In line with the latest evidence and best practice the second edition features new chapters and content, with revised advice and guidance. This is the essential reference and guide for anyone involved in professional bat work.
BCT Members receive a 20% discount: please quote your membership number when ordering (in the ‘comments’ field when ordering online), and the discount will be applied when we process your order. Please disregard the full amount quoted in your shopping basket and automated order confirmation. If you are not a BCT member, click on the following link to join online now and claim your discount.