Great question — answering as the UphillTech team:
Best practice is to use the full address of your company in all of your listings including your My Business listing, Google+ listing, etc. If one of the Google services is not showing the county this could be due to the address that it has on file not having the county on record, the county not being relevant to the search query itself, or it could be a glitch within Google not considering Dorset as a county and discounting it from the address. From an SEO point of view it would be better to have Dorset show in your address as if someone does a search for services you offer but anywhere within Dorset you want to come up, however Google is intelligent enough that if someone searches for xyz...
Full answer by Chris Rutherfurd: https://webmasters.stackexchange.com/a/105506 (CC BY-SA 3.0).
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