This free course was written by Kate Burgess of Middlesbrough College using materials belonging to The Open School Trust Ltd. (trading as the National Extension College), in partnership with Bedford College Group, West Herts College and The Open University. Copyright in this material belongs to The Open University, 2019.
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Figure 1: © Kostiantyn Kuznetsov / www.123rf.com
Figure 2: © David Bleeker - London / Alamy Stock Photo
Figure 3: © Olena Yakobchuk / 123 Royalty Free
Figure 6: © Benjawan Sittidech / 123 Royalty Free
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