Developed in accordance with the Medical Research Council framework for designing multi-component interventions this study utilises Social Cognitive Theory (SCT) as a theoretical basis. SCT describes the complex interaction between individuals and their environment. The influence of the office environment on sedentary behaviour is clearly illustrated by differences in people's sitting patterns inside and outside of working hours . Behavioural change techniques linked to the constructs of SCT have also been shown to have a positive impact on sedentary behaviour, namely education, goal setting and feedback. Participants in this study will therefore receive education on the benefits of breaking their sitting, tips on how to achieve this, and feedback on their baseline sitting behaviour. This study will test the impact of these techniques on sitting time and patterns, and also track their influence on the different constructs of SCT and individuals' readiness to change by measuring these at time points throughout the intervention. To address the fact that sitting at work may not be a conscious decision, but performed out of habit, half of participants will also receive prompts reminding them to stand. The same prompts will be used as in the pilot study, but the addition of an extra activity monitoring period will enable us to ascertain whether the impact of prompts diminishes during the intervention period.