I have never seen anyone give away for free a RH Designs, Heiland or Darkroom Automation fstop timer. Even if there were giving up darkroom work why would anyone just give away such a saleable item that might have cost him 200GBP even a few years ago.
Occasionally a second-hand one will come up on e-bay. If you have studied what the RH stuff will do for you and I suspect you have and if you are into darkroom printing for the long term and from what I have seen I suspect you are then sadly you may have to "bite the bullet" as they say and spend the money for a new one.
Over the course of several years the cost per print of using one will not be that much and if at any stage you decide you can do without one then selling second-hand will lose you only a little.
Having said all that, you might be lucky and find someone willing to give one away so I wish you the best of luck.
pentaxuser