I would use 2N5457 transistors regardless, they seem easier to source in UK/Europe and can be used in the same circuits. Just make sure you leave yourself room to play with the trimpots to bias it right. :)
I know the English Channel is a straight JFET adaptation of the Vox AC30 pre amp (not sure about the Galileo), so it would lend itself very nicely indeed for experimentation straight before the power amp section as I mentioned in my previous post.
I've actually been thinking about building a good SS power amp to experiment with pres etc, will have a good look into that Rod Ellis design!