Thanks Loz, in the very few bits of info about Clive (first name terms now!) that there are on the net there seem to be oblique references to stuff he has built. Maybe I am misreading things. I have seen some pics of his work and it does indeed look very fine. (if anyone cares to discuss relics then, ummmm.... I do not. I am not buying for anyone else). It is probably something to do with my slightly tragic anorak completist traits as well.
I think that my main pleasure in the more mature instrument comes from the fact that because I played on a beaten up Jazz for so long I just got used to not having to look after the instrument I am playing. Since I moved to 5 strings MANY years ago this changed but I have been playing some older 4's recently and just MASSIVELY enjoy not having to care about whether it is hitting the arm of the chair, whether my coat zip is damaging the finish or how close is that shelf. The Alleva stuff looks very fine indeed, and would probably tick all my sonic boxes, but I also crave a bass that I do not need to cherish and nurture.