Small firms in tourism are characterised by informal approaches to management, allowing their owners to meet a variety of often overlapping business and personal goals. Environmental certification schemes generally require members to subscribe to formal environmental management systems (EMS), even when aimed at small business operators. This paper examines in detail the managerial approaches of a small group of owner-managers who are operating within the approximately 3000-member Green Tourism Business Scheme (GTBS) available in the UK and Ireland. The findings suggest that the type of environmental practices adopted most willingly reflect the formality of management within the business and the owner-managers’ various backgrounds, values, reasons to be in business, expectations from acting and their understanding of the “environment”. It finds that the “Plan-Do-Check-Review” approach of most EMS does not easily relate to the complex motivations and needs of the world of small business. The paper concludes that environmental engagement is more likely to be fostered if owner-managers’ managerial approaches and assumptions are better understood and that shared visions for environmental engagement are encouraged through informed dialogue. Both economic benefits and the fostering of “feel good” factors should be stressed if small tourism businesses are to adopt EMS programmes.