Education Scotland – Maths Investigations and Problem Solving Activities
From OCR: Maths investigations OCR
This resource is the complete book by Lorraine Mottershead; solutions to the puzzles and investigations are included.
Also on the National STEM Centre from David Kirby and Peter Patilla we have Maths Investigations – Pupils’ Workshop together with a comprehensive teachers’ guide.
An old Edexcel document: edexcel-gcse-coursework-tasks-and-projects2540-new-v2