A good article relating to ‘shift in demand curve’ – https://www.bbc.co.uk/news/business-46774053

See below where to find the relevant section with the AL Spec:

Edexcel spec reference 1.2.2 b) The factors that may cause a shift in the demand curve (the conditions of demand)

AQA spec reference 4.1.3.1 The determinants of the demand for goods and services

OCR spec reference P7 Explain the factors which cause a shift of the demand curve