Here you can find lecture notes, exrecise sheets and video links for all lectures.
Course material and notes for BUSSTEPP@50 will appear as they become available.
For extra references, see the beginning of https://arxiv.org/abs/1709.04891.
For a more comprehensive discussion of amplitudes online, see https://arxiv.org/abs/1308.1697 and https://arxiv.org/abs/1708.03872