Page Rank is not the best marketing model for deciding what directories to submit to. Cached pages, age, and quality of submissions is a much better method.
Hi, To get good visibility,promotion for your site you should concentrate both on high pagerank sites as well as quality content,both are important for site promotion.Concentrate on both to get good promotion for your site.
I once found a dropped domain with a high PR. Guess how much good it did me when I converted it to a directory and linked to my sites? It did 0 good. I actually went down in the ranks because of it.
Why should ".co.uk" had anything to do with a good ranking. Just find a list of high PR directories and insert good content. No CTRL+c and CTRL+v.
Check out the Solicitations and Announcements section and search for "UK" or start a thread asking people to send their suggestions via a "conversation" unless you have a form for them to submit to.