Hi Carole,
The Ambla seat covering did indeed appear in the 240 and the 340, but somewhere, I think it was in a sales brochure for the USA that I looked at while doing my research on the Jaguar Mark 2 indicated that the 1960 version had leather seats as an optional extra, and I think that most of the cars produced had that option fitted.
I don't know where I found that brochure, but when I have the time I will look it out from the mountain of paper I have used.
On the use of wood in cars, my 1962 Triumph Herald had a lot of wood, mostly used to stop water getting in through the floor. Sadly, and with 98k on the clock and the MOT ,which was a 5 year one and which only had brakes, lights and steering, to pass issued me with an advisory that the car was falling apart, the car finished up on the Council Tip!
Regards,
Peter.