Another site worth viewing http://50aworks.wordpress.com/ Tom also posts on the Modellers United forum with a nice workbench thread but they're moving servers at the moment so might not be fully accessible for a few days.
Scotsman got the banjo dome in 1947, so right at the very end of LNER. Deflectors in 1960 and the double blastpipe in the 50s. She's going back to an A3 boiler during this latest overhaul but she has been on an A4 boiler for a long time and I'm pretty sure Hornby modelled her that way for the NRM edition.
LNER forum http://www.lner.info/
Although he models the Eastern Region in BR days Tony Wright from BRM knows a hell of a lot about LNER steam. Worth looking at his thread on RMWeb too (even if just for the gorgeous layout and models) http://www.rmweb.co.uk/community/index.php?/topic/64295-wright-writes/
Then there's Grantham which is 1930s LNER http://www.rmweb.co.uk/community/index.php?/topic/58826-grantham-the-streamliner-years/ and Peterborough North (again BR days, but might be of interest http://www.rmweb.co.uk/community/index.php?/topic/18451-peterborough-north/)
A4Mallard and I keep saying we should have a gathering of our A4s on his layout sometime, I have four and he has many, many more! I like the BR days of the former LNER and the LMS (moreso) and mixing them with Standards and diesels. I do have a Q1 too, irresistible bargain from Grahams, lovely model and in my defence could be found on cross city freights on the North London line. Can't explain the Merchant Navy mind you....
Anyway, hope that's of help! Plenty of interesting reading.