Further to my earlier observation of JWST I did a follow up observation last night (14/01/2022). Interestingly the brightness followed exactly the same curve as on 05/01/2022. In the graph I have plotted the two curves together to do this I time shifted the data for 14/01/2022 by 9d 1.173 hours which gave the best alignment. The 2 additional spikes in the data for the 14th were also seen by a friend who observed on the 12th. So it seems the pattern repeats on a daily basis. What this means for the movements of the spacecraft or the angle of illumination is an interesting question!