The test piece, a Harrier with added plenum chamber burning, has recently been acquired by the Helicopter Museum here in WsM. It is not fully representative of the BS100 front nozzle design but certainly worth a look.
I seem to recall the BS100 is very wide and would have given the 1154 substantial frontal area. Not sure if it was made viable. RRHT used to have a complete engine, not sure where it is now.