Looks like 'Babs' got a good reception, it must have sounded wonderful! That bike beyond the Indian is interesting- a Greeves fitted with a Triumph(?) engine.
Yes, well spotted.
+1 it was a popular special in the Trials world back in the 70's. Mine was originally a Scrambler (250cc Viliers 9E) and now sports a 350cc Triumph T21 engine, used for Green Lane riding in the 80's. Many of the Trials versoins had 500cc T100 engines. Shows how strong the Greeves Chassis was (is).