The 1960s Chappell fire - was there ever a "lost" inventory? (esp. re F. Clay)

[pcc]

I was curious about this because I know Sullivan's cello concerto went up in the fire, but I was reading through Fred Clay's cantata LALLA ROUKH (which contains "I'll sing thee songs of Araby") and the title page mentions that "performing materials may be had on hire from Messrs. Chappell".  I assume those parts went up too, but who knows?  The parts for IVANHOE survived (scorched, as I recall), so other things must have as well.  On the other hand, I'd also like to know what exactly was lost.  The whole of the Clay work is very attractive, and I'd be very curious to find out how he orchestrated if a full score or parts exist, especially as it was a festival work.   Any ideas?