Try this link:
http://britishrailwaybooks.co.uk/boo...swan.php#mrlms
The LMS Locomotives Profiles are well down. The Royal Scot Book is out of print, but may be available second hand.
Below that there is a book on the Patriots, Historical Monographs No.3, which is very good. The LMS Patriot Project sell copies if you are interested.
Best wishes,
John H-T.