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We have number 1 positions for employment searches ending in 'UK' which are competative searches.
Ranking is not dictated by PR alone, there are loads of other factors e.g. relevancy, word frequency etc. etc.
It might be an idea to put the UK at the end of the title as opposed to the beginning.
I have a couple of sites that target UK visitors only and I get very good results, I always put the UK part at the end of the title.
One thing to make sure of if you put the UK at the end of the title is that no SE truncates the title and cuts off the UK part as this could give you visitors that would not otherwise want.
Good Luck :)
Dazz