[Hybrid tellies]

I am looking for a circuit diagram for the Binatone Mustang transistor radio. This dates from 1970. I know it's a typical cheap and nasty piece of Hong Kong tat but I am very keen to get it going properly.
The audio is a bit distorted. I have checked the mid point voltage and idle current which appears to be ok. I have also proved that the speaker is ok.

I have checked this sites service data and done quite a few Google searches.

I was wondering if anyone, who has access to the Newnes Service books or the Trader sheets, could take a look for me? In the Newnes Service books, if it is there, it will be in the 1969-1970 or 1970-1971 editions.