What are the key concepts concerning statutory interpretation in the UK?

The questuin is (What are the key concepts concerning statutory interpretation in the UK)

-Aim to write 2-3 paragraphs

-Structure your writing around the concepts themselves, referring to sources to support your points

Have uploaded the sources, they are two:

1- Ghaidan vs. Godin-Mendoza [2004] UKHL 30

2- Van Zyl Smit, J. ‘The New Purposive Interpretation of Statutes: HRA section 3 after Ghaidan vs. Godin-Mendoza’ (2007) 70(2) MLR 294-317