No first hand experience of their basses, but I've owned a Tokai Love Rock (Les Paul) and one of their Strat copies from the 80's (I think it had something cheesey like "oldies but goldies" on the headstock) and both were fabulous guitars.
I do have a Vintage (brand) P bass - possibly a VB4, not sure - and it's... OK. Decent Wilkinson hardware - nothing to get excited about, but I'd happily gig with it.
I have, on occasion and depending on the design of the jack, been able to pull a tiny contact file, from my Strowger days, between the contacts.
For a clean barrel & t/r contacts, a squirt of Servisol on a cotton bud is my preference.
How does dirt/oxidisation on the barrel (or ring/tip contacts) of a jack socket cause problems if there's normally nothing plugged in to it?
More likely the problem's on the (normally made) switching contacts, and breaking them a few times by inserting a jack plug cleans the contacts sufficiently to get rid of the problem. No gloop squirting required - although I guess some of it may find its way to where it's really needed.
I've always found PMT in Cambridge very accommodating.
Have a look on their website for anything that takes your fancy, then ring to confirm they've got it in stock?
(They're also in Norwich & Romford)
I have 4 pairs laying around the house.
2 pairs of Sennheiser, a pair of Superlux, and a pair of Phillips which can be used either wired or wireless. I've no idea of the model no's. - I just grab whichever are most convenient.
Not used them myself, but I used to use a rehearsal place in Stevenage, and the guy that ran the place used - and spoke highly of - Mal at The Amp Workshop (also in Stevenage) for all of his repairs.
https://www.facebook.com/malcrawley139
I was in the same position a few months back. Ended up giving it away through a local Facebook group.
We humped it out of the front door, expecting a van, but he pushed it up the footpath on its wheels...