Hello Alan

I know there are more options but here are two:

Tweetdeck Directory @  http://www.tweetdeck.com/#directory

Search in Google – By telling it where to look, you can search the entire site for a specific tag or keyword. Enter in a sting of words that look like this:

site:twitter.com/*/YOUR TAG

Replace [YOUR TAG] with the term you’d like to find. Click on any link you find to see the list of member tweets.
  
I like the Google option as if you know the hashtag of what you’re interested in ( i.e. basketball, candles, lingerie, baseball, whatever!) you get a very long list. Of special interest can be things like court cases, brands, competitors brands, etc.

Eileen  

Listorius provides Twitter lists. You can also add lists on the site. 

Hi Folks, sorry for the delayed response, been at a trade show for the last couple of days.

@supereb thanks so much for taking the time and trouble to write back with these tips. I have not had a chance to try them yet but will give it a go over the weekend. Thanks also to @deborahlatham-white for your Listorious tip.
You guys rock!!