Erik Anderson:
There was an Avro Arrow orbital-launch concept?

I've never seen this. Can anyone give me a reference?
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That can be taken with a grain of salt. The concept was
alluded to in the movie about the Arrow program and may be
no more than that. Though Jim Chamberlin's later work with
NASA does show at least a passing interested in spacecraft.
The weapons bay on the arrow was 16ft long The Mk2 was
fitted with the the newly designed Iroquois engine but never
flew(program cancelled). It was expected to take the speed
record from the US (then held by the F-104 Starfighter).
A Mk 3 version was planned using a stainless steel in high
heat areas and take full advantage of the new engine.

As the US has launched a missile from a F-15 fighter to shoot
destroy a satellite, it appears a workable concept. High-speed
craft with provision for aerodynamic heating work with the
concept of porposing in the upper atmosphere to lob an upper
stage and payload at both high-speed and high-altitude.