Moth3r said:

You mean try a sample out with Srestore? Send me the link, I can have a go.

Update on this: some time ago monks19 provided me with a sample from "The Martins and the Coys". I found that SRestore was reasonably successful in producing a 23.976 progressive fps clip. After trying a few different bob filters I eventually settled on YadifMod as the one that gave the best results:

MPEG2Source("D:\Video projects\The Martins and the Coys\t2.d2v", cpu=0)
YadifMod(mode=1,edeint=NNEDI3(field=-2))
SRestore()