I have started using Lightroom5 and I generally organize my photos by location. So if I have taken some photos for a new location I create a new photoset (i.e Liverpool) drag my images to it and publish, they are then all created in a new Flickr album.
Hoewever I have been using Flickr for a number of years, is there a way to let know Lightroom know about existing albums and get Lightroom to list them as photosets. So for example i have an album called 'Manchester', I have recently taken some new Manchester photos and would want them added to this existing album in Flickr, but there is no photoset listed for that album.