An article in ME 6th July 1979 gives details of an alternative lubricator placed under the footplate.
The reason given for moving it from behind the front beam to the footplate is that there is no cover over the gap between the beam and the smoke-box, leaving the lubricator much too visible in that position.
On a related note, I have recently started building a 5″ Lion, I would like to make it more prototypical than the LBSC drawings, so was wondering if anyone knows where I can find some detailed info on the prototype?