For 'Riviera Line - GWR Era' route
Details: videos, consist notes and requirements Page 1
Details: videos, consist notes and requirements Page 2

Free Download as an RWP from Google Drive

For 'Wycombe Railway and Joint Line' route
GWR North-west Consists for DT's County 4-4-0
Details: pictures, consist notes and requirements PDF

Free Download as an RWP from SendOwl yes, its free.