AC Cars Ltd events of 1929

[Peter Cairns]

Hello knowledgeable AC Cars enthusiasts.
   
   I wonder if someone who uses this site could provide leads to the type of information I am seeking?
   
   It is my understanding that in 1929 AC Cars Ltd went into voluntary liquidation. My interest is engine work that the company was carrying out for the Parnall company of Bristol. Are there any documents, correspondence or records (other than those at the National Archives) that still exist from that time that could give more detail of events? If so, where are they located?
   
   Many thanks.