With Random Acts of Genealogical Kindness (RAOGK) no longer operating after the death of its owner, another group has sprung up which could replace those valuable volunteer services.
It's called Generous Genealogists and one can register to provide help to others, or ask for help from other researchers. The web site is set up quite differently from RAOGK, but it's usable once you've gotten used to it. One can also get advice from a Brickwall Forum and a Coaching Forum. Both could prove useful.
Thanks to Brenda Turner for the tip.