Gary what's the 4F's number again? I might contact the KWVR and see if they want to keep us in touch here at the site as its an ex-SMj loco. You can always try!
I've found out that it was shedded at Gloucester Barnwood in '60, so if it was shedded there in the 50s it could have been fairly frequent on the Broom to Olney route through freights. In the 40s and 50s the regular SMJ pickups and passengers would have been shared between 21D Stratford and 2E Northampton 4Fs and 3Fs, while the regular ironore trains would have been Northampton 8Fs, after the Olney line closed all pickups would have been 2E workings.
Just seen in the Railway Modeller (Jan 2010 edition pp73) a review on a book on "The Blakesley Minature Railway and the Bartholomew family" by Dr Bob Tebb ISBN 978 1 85794 339 9 published by SilverLink Publishing Ltd. Softback £19.99
Thought I'd share that seeing as it almost related...
I was given a 'The Steam Archive ' collection of 3 DVDs as a Christmas present. In was one of those green Umbrella budget collections from 'The Works'. One of the DVDs is called 'Steam in the 50s and 60s' and on it is short clip of the SLS Last SMJ Railtour leaving Snow HIll behind the 4F and the Pannier heading for the SMJ.