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 The determinants of the demand for goods and services

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