I'd hesitate to use the word fake, there was definitely a spec from the UK Air Ministry and a 10 engine design from Avro, no official drawings or renderings of that deign have yet come to light however. There is some detail in Tony Buttler's BSP 35-45 on the spec itself and the competing designs.
This page has an artists rendering based on the memory of a former Avro worker. When I emailed John Dell to question him further on his source he gave me more info and sent me more sketches of the aircraft based again on Dave Dixon's memory of the project. This could be the closest we ever get to this design. I hope not!