Opentuition has been an absolutely fantastic resource over the years, as I have worked my way through the ACCA papers from F1 through to SBR. Only two left (woohoo!)
However, and I hate to say this, the SBL notes are very poorly written (or, more probably, poorly edited/updated).
Please, Opentuition, have someone read through the notes and bring them back to the, usually very high, standard expected by users and provided by Team OT.