The Ritangle competition is produced by MEI each year and it is a series of hard maths problems. Here's the link to the preliminary questions. It is open to A Level students plus you need some nominated teacher (me). Find me when we start the half term and we'll register a team. I having quite a lot of fun solving them.
You're not getting a proper article from me because I decided to walk from Worcester to Malvern today and I'm tired.