I bought this sleeping bag off a climber earlier in the year and I haven’t used it. It is in very good clean condition. Lightweight and warm. No zips and a fairly slim width.
I have asked for the same price that I paid for it. Happy to deliver if reasonable distance and I will be at Kendal mountain festival all the weekend of - and can take for collection from there if helpful. or I can post at cost. 

what weight is it (fill power and actual weight of the bag) and any thoughts how many 'seasons' its rated for?

Hi it weighs 900 grams. I have just spoken to the climber that I bought it off. He says it is probably rated 2 , a given rating for its purpose as a lightweight bag which can be packed small and carried on a difficult climb. He used it for such and for Alpine bivouacs. You’re welcome to look at it and return it if of no use to you. But paying the postage for it. 
 

Looks like an old 80s vintage  ME bag from when they were made in Glossop. No such thing as fill power ratings in those days! I have a redline jacket of the same era which still works just fine.