Interesting that Nicol Williamson's name pops up again as I posted the same question on this forum last June (18th).
On another film forum in the year 2000, I asked what ever happened to him and someone from England replied to me:
"Alas, the gossip I heard is that he's even worse than those two [the late Harris and O'Toole during their drinking days]. Even his agent has had difficulty contacting him, because he doesn't know which gutter to look for him in. A great pity. His portrayal of Merlin in Boorman's Excalibur still haunts me, almost twenty years later. O'Toole and Harris are still relatively employable, but Williamson's consumption of alcohol makes him too risky a proposition. At least, that's what I heard...."
Of course, we do not know if this is true, I hope not. That was 4 years ago. One thing is certain: I adored him as Little John in Robin and Marion and as Merlin in Excalibur.
He was a great and magnficent actor.
Not knowing what is going on with him now is the worst part. The same applies to the great actor Kenneth Haigh
Genevieve