It’s quite simple. If you subscribe to this blog, for example by getting an email every time I write a new article, I will only use your email address (and your name if you provide it) for that purpose. If you subscribe to my newsletter, your email address (and your name if you provide it) are only used for the newsletter.
I don’t do marketing on the blog. The emails I hold for the blog and newsletter are not shared with any other party.
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Separately, I have access to the full electoral roll for Ludlow North. Councillors are provided with this to allow them to fulfil their duties. That data is controlled by Shropshire Council.