https://preview.mailerlite.com/f1w3e1/1522495799294957436/b0g1/

They are free and include

How to tune the LHIRES III  (Tricky as owners will know)

A live session with the LISA  (The BAA has one available for loan to suitable applicants)

and an intriguing one (just in French unfortunately) on Exoplanet spectro-photometry using a Star Analyser

Cheers

Robin