Hi Kathy, I'm not a UK VA but wanted to make a quick comment that a good press release distribution point is going to have global reach and possibly have a feature to allow you to direct your release at a particular region.

Also, when you submit your release, you're going to include whatever location information is necessary, so the PR site being based in the UK isn't necessarily a prerequisite to successful distribution.

I would simply compare the features of the sites you are considering using, also watch to see which of these sites' releases index in Google News because ultimately that is where you are going to get the most impact.

I realize that doesn't directly answer your question but I hope it helps a bit

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