Hi Ian.
Are you there on 6th Sept? SRPS are running the 'Forth Circle' railtour with 'Union of South Africa'. Detials here:
http://www.srps.org.uk/railtours/rt-150906.htm
Also the Scotrail trips over the relaunched section of the 'Waverley' route (again with 'Union of South Africa'):
http://www.scotrail.co.uk/scotland-by-rail/steam-trains
Enjoy your trip,
Tony