Duly admonished I intend to read Harker, though I repeat while Roud does 'rubbish' him, he does several times refer to/rely on his scholarship. So not a wholesale dismissal of absolutel everything about Harker.

I note that Vic Gammon somewhere did express some sympathy with aspects of what Harker says.

Here's an interesting review (found while googling for cheap 2nd hand copies).

Review of Harker