The original general arrangement in ME is signed Leslie Clarke and credited as such by LBSC.
In 1970 a picture of his original Tich appeared in Smoke Rings having won a certificate at the ME exhibition, but how this is the ‘original’ when he only provided the GA and LBSC the rest of the design, and LBSC built his own loco, I am not totally convinced about.
A few articles by Leslie Clarke appear in the ME Index and also an obituary in issue 3939 vol 170 from 1993 but unfortunately this is an edition not in my collection.