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File formats

This site principally uses files of the following five types. Users will need to have the correct software loaded on their machines to make full use of the information available.


HTML is the basic file format used on the Internet, this page is in HTML format. It is our policy to make as much information as possible in this format. Sometimes, for technical reasons, some data may be made available in the following alternative formats.


Many of the documents on this website are PDFs. If you do not have Adobe Acrobat Reader installed you can download it for free from the Adobe website.

Viewers with visual difficulties may find it useful to investigate services provided by Adobe to improve the accessibility of Adobe Acrobat documents. See


doc is the file type for documents created using Microsoft Word. This is a widely used word processing package.


xls is the file type for documents created using Microsoft Excel. This is a widely used spreadsheet package.


csv stands for comma separated values and is the spreadsheet equivalent of text files. You can cut and paste a csv file into the spreadsheet of your choice, or download to your PC.

Downloading files or documents

In the case of relatively large files, or files that you need to work with (such as Word or Excel documents, or interactive PDF forms), you are advised to save the file directly onto your own computer rather than opening it using your web browser.

On a PC, and using Microsoft Internet Explorer, right-click on the link and select Save Target As, and choose a suitable location on your PC. If you are using Mozilla Firefox, right-click on the link and choose Save Link As.