Had the info in the Google Reader about a free listing weekend this week for UK residents and have been picking out several stamps I'm not using anymore and will probably cull more.
Currently am listing at £0.99 both used and new.
Have a look here, maybe there's something you're interested in?
Also figured that your first 100 listings per month (?) as private seller (if starting price is less than £1) are free ... so no need to rush right now, think I'll be posting lots more stuff over the next weeks. :)