Update: This list is less detailed, but more comprehensive
I have a degree in Economics, but I did some extra Maths modules and then trained as a Maths teacher instead.
Resources for Maths are everywhere, and really easy to find. There's a lot of rubbish out there, but also some really useful advice and high quality activities. Best of all, much of it is free. It's comparatively hard to find resources for Economics. I don't know whether that's because fewer students learn Econ, or because it receives less funding or whether it's because we're more rational and don't give out stuff for free (!). Regardless of the reason, without a specific Econ PGCE under my belt, and with my first A-Level post being in a department of one in a brand new sixth form, I ended up doing a lot of legwork in that first year. Since then, I've developed a bank of go-tos.
In no particular order:
#1 Tutor2u If you're an economics teacher who hasn't heard of Tutor2u, you have clearly been living under a rock. These guys know their stuff. They have a range of paid and free resources across the curriculum. I highly recommend their end of topic tests and their videos on country profiles and synoptic topics. I would normally divert away from their theory videos for lower ability learners as they feel quite advanced, but they are great for middle- to upper-end.
#2 Economicshelp - This is my go-to for well-explained text. Tejvan Pettinger has a real nack for getting a great balance of context and theory (also photography and up-hill cycling). This is a good place to start if you are looking at a big question like 'Should we worry about a budget deficit", or to support students with essay writing. It's not the easiest to navigate, so I often google "economics help monopoly" or whatever I'm trying to find.
#3 Facebook groups - I use those run by the exam boards and Tutor2u. Edexcel GCE Economics has a good better dropbox, nicely organised by unit. The Tutor2u dropbox is a bit of a free-for-all but there are some gems, and the discussion board is particularly good.
#4 Twitter - This is quite good for finding news stories relating to whatever you're teaching. If you're not sure where to start, try this list of Econ teachers and depts
#5 Econplusdal - The man, the myth, the legend. His (free) youtube videos are tailored towards the UK curriculum and are good, concise summaries of each topic. Really useful to point students towards him for independent learning/revision/flipped learning. I particularly recommend his "Examples for everything" videos around exam time. Check out the Year 1 Micro Notebook and Year 1 Macro Notebook which work really well alongside these videos: essentially they are a set of notes frames (digital and print versions) for students to record what they've learned in each video.
#6 MR University - While Econplusdal's vids are great for revision, Marginal Revolution's videos are often excellent for instruction, explaining concepts slowly and clearly. This one on supply is a good example. I mostly use these for AS Micro topics, but they are also really good for Development Economics. I have set of notes frames for their series of Aid videos that I use for independent learning over the summer or that last week of term when lots of students are out on trips or are mysteriously "ill", so they can catch up by themselves. It also includes sections on the World Bank and IMF.
#7 ACDC Econ - This guy talks crazy fast, but again, explains concepts well. I tend to use him for AS Macro and A2 Micro (I know it's not A2 but we all think of it as A2). Sometimes I have to put him on 0.75 speed so he sounds vaguely normal.
#8 Exam Board Websites - A great example is Edexcel's Getting Started Guide - not so helpful if you're not on Edexcel, but indispensable if you are. It sets out everything you need to teach, and acts almost like a mini textbook. This is my lesson planning bible- I go through it and think "What's the most effective way to teach/practice/assess this information?". It's very concise so great to use in gap fill exercises if you copy it and get the Tippex out. Their case studies, particularly those on the Great Depression and Financial Crisis, are also worth a look (and good for cover work). WJEC has a useful little resources page, I especially recommend some of their monetary policy stuff. I've never found the stuff on AQA especially useful with the exception of their info Teacher's guides on Financial Markets and Monetary Policy and Behavioural Economics, which lay out clearly what students do and do not need to know.
#9 Multiple Choice Questions - So not technically a website, but a web-based tip. MCQs are very very useful, but it's tricky to find free worksheets based on UK courses. Tutor2u have some nice, short free ones, and some of the paid publishers (ZigZag, A to Z etc) have packs for the AS part of the course. However, US universities and high schools tend to use MCQs, so searching 'site:.edu [topic] exam' usually yields some good results.
#10 Econlib - These are my go-to for setting wider reading that isn't news-based. They have resources for 51 High School topics, but if the topic I want isn't on the list, the College-level resources are usually fine for middle- to top-end.
(Sneaky) #11 Econosaurus - Now I'm no longer in a permanent teaching position, I've more time on my hands to create resources and also point you in the direction of some great resources already out there. There's not too much here at the moment but you should see it growing rapidly and becoming more organised.
If you have any essential websites I haven't mentioned, please do share them by commenting below