Hi Chris,
Have a look at the A705 Casualty files at the NAA Canberra.
Lambourne, 421428 has the results of an inquiry by the Red Cross giving more details and what was found at the crash site.
The links time out so you need to do the following steps:
http://www.naa.gov.au/collection/search/
Click on record search
Put the following into the keyword box
Lambourne 421428
Hit search and then click on the sheaf of papers icon on the righthand side.
As with all casualty reports start at the last page and read forward.
After that try a basic search on EF271 it will bring up the other document references.
If they have not been digitised yet you can have this done for a small fee and the images will be placed ready for web viewing.
Regards
Ross