"no Soltr worth his or her salt should allow it to drag out for 6 years."
Very unfair comment. I have clients who are advised and who then choose not to take my advice. That is not me dragging it out- that is the client. In difficult cases, yes, it can take this length of time and, in this case, it sounds as if that is primarily the husbands fault -not the wifes and not the solicitors.
While Divorce here is on a no fault time basis, where bad behaviour is used in the process, it would need to be brought before a Court for any account to be taken of it - in settlement, it is unlikely the recalcitrant partner would care to give ground based on the bad behaviour.
mf