BadBassDude

Thanks for the feedback everyone. 

Warwick were indicating (not quoting yet) a large bill.  I'll look up Jon Shuker; thanks.  

I'll be back (!) to let let you know how I got on.

Thanks again all.

The tech nerds at Warwick have suggested a fret board off, open rod surgery approach.  I have admitted defeat and I am ready to send the useless wooden ornament to the bass hospital.  But i don't like my chances of getting it to Warwick and back again in a post Brexit world.  Looking for a competent doc nearer to home.  

Anyone?

Thanks guys.  It's a 2000 model.  I've tried the counter clockwise and clockwise adjustments, gradually (1/4 turn at a go) over time, to no avail.

If I remove the strings, neck returns to straight as an arrow.  Strings back on and the forward bow returns (obviously I suppose).  

HI.  I'm up here in sunny Yorkshire with my bad donkey but naughty Warwick thumb NT5.  Naughty I hear you ask?  Shenaningans with the truss rod (lots of tension on careful adjustment but absolutely no movement to correct a forward bow). 

Can anyone recommend a Luthier / magician who can be trusted to fix the blighter?

Thanks in advance.