HNB ceased trading in June 1998. The tuners that were left - Myself, Reg Lane and Colin Jilks were given (not sold) our tunings so that we could continue under our own steam. The other tuner who continued until that point was Neville Newby who retired.
A little while after the closure, Bernard Whitmill of Heritage Organs purchased the name but doesnt seem to have done anything with it.
Peter