John,
Unfortunately Bristol stopped releasing any detailed technical documentation long before the 603. The latest workshop manual I have seen is for the 408, although they did still have parts lists up to the 410. Neither exist for the 411, or probably for any model that came after that.
However, Bristol didn't change things just for the sake of it, consequently the last 411 series has part numbers that belonged to the 407.
My memory isn't completely reliable but I think it took quite a bit of effort to get the seat back off the first time I removed it on my car. However, I don't want to recommend brute force without knowing for sure how the seat is fixed at the top. That said, what other options are possible?
Hopefully another 603 owner who has removed their seat back can confirm how it comes off. When you solve the puzzle please let us know!
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