It must be over 15 years since I last did a trip in Llethrid. As Gus commented, the route through the streamway was forever changing due to debris/boulders being moved by winter floodwaters.
I recall hearing SWCC bods saying it was blocked in the last year or two. Of course, this used to be said by various people years ago and when I went down the cave and knowing where to look, I found blockages to be non existent.
So, if there is any fresh info out there, I'd welcome it,
Cheers
Paul