Just re read my gillham guide, and under the section differential, it actually has the nose braced. It says, an additional length on 19mm box can be fixed between BR12 & RS3, with a 5mm packer welded between RS3. The second engine mount rubber can be used to secure the front of the diff. I have revision 3 notes, so maybe it was not in the earlier build spec. Maybe we were all that keen, we missed it. 19mm box & 5mm plate it is ! ( picture in notes is - figure 41 : front lower diff mount position). Tidy on a Friday !
