The data is in the format 8-N-1
Are you sure that this is an SPI interface? 8N1 is the most common format for an asynchronous serial communication (UART) and I never heard of it's use in SPI communication.
Ah!, I'd assumed it was SPI but looks like I'm wrong 
Can I capture it as asynchronous data then? Guess this would mean that I wouldn't need to worry about software SPI for the display.
Many thanks for pointing me in the right direction!