Don't want to go to war, but I used to run my own repair shop some 15 years ago (guitars, basses, amps and even classical instruments) and owned for myself something like 150 basses from the cheapest to very expensive ones
I played bass, double bass and a bit of guitar over the 3 past decades, recorded a few albums and repaired so many of these old Japanese instruments that when I think about it, it just makes smile when i see the today price tags according to the real quality of these instruments and I agree when you say it's worth £50 GBP.
So let's say you had all the good ones and I had all the bad ones.