The mechanism of formation of tubular polythene film is a complicated process, and extensive studies have shown that the properties of the film made are influenced profoundly and in a complex way both by the processing conditions used by certain design features of the equipment. Studies of the effect of the extrusion variables on the more important film properties, both optical and mechanical, are reviewed in this paper. The results are discussed in terms of the fundamental nature of polythene film, its surface, its crystalline structure and its orientation.

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The article analyses the relationship between the United Kingdom and its Overseas Territories since the publication of the 1999 White Paper Partnership for Progress and Prosperity. The article considers the efforts by the UK government to improve links with the territories via a new partnership based on mutual obligations and responsibilities. The article focuses on the two most important aspects of the White Papergovernance and economic growth and sustainability. Much has been achieved, but fundamental structural problems in the relationship remain unattended. The article concludes by recommending how the relationship can be improved over the coming years.

Guyana is potentially on the threshold of great change. The growing importance of gold-mining and logging, and the rising hope that sizeable quantities of oil will soon be found should act as a catalyst for a dramatic improvement in Guyana's level of development. However, these industries require responsible management and there are concerns that severe weaknesses in Guyana's governance structures will place major constraints on its ability to develop in a sustainable way. The article gives an overview of Guyana's pattern of economic development and the problems associated with key economic sectors. The article then considers how its quest for development is being enhanced and sometimes hindered by its expanding set of foreign relations at the regional, hemispheric and global levels. The article suggests that there is a real chance for Guyana to make a step-change in its level of development, but important internal reforms and a delicate foreign policy balancing act are required for these gains to be realised.