The CR archives have one entry; from Ian Briggs, Luton - UK, in which he wrote that he owns a 1981 super lightweight ex-Sean Yates Emperor Sport TT bike.
Angel Garcia Long Valley, NJ
snip:
> Good fellows,
> Can anyone kindly provide some details of the English Make 'Emperor
Sport'? ....I recall this was the favoured mount of that powerhouse, Sean
Yates for a time but, having done the cursory web checks I find very little,
well nothing actually, about this marque.
>
> Cheers
> Peter Janecek
> Sydney
> Australia