Solved

Historic Circuit Data

It seems that laps/stints/fuel levels are no longer viewable?

You mean for tracks that aren't used anymore?

For some reason all historic data for anything after last season, I can't click into see my previous season strategies. 

Hi Charlie.
The data is deleted after a period of time because of limitations of data storage on the servers. If you're using a computer you have the opportunity to export the detailed race data as a csv file and save it on your local device.