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Thanks Dirk. I also use moz, ahref, semrush and sometimes majestic (free versions). However in the last week I signed up to MOZ.  I'm now thinking that if my main goal to analysis back-links I should probably use another service like ahrefs, as I've tested and get a lot of back-link info from. Thanks again Jon

Hey Jon! If you feel totally confident that Google will agree that these are 2 different forward-facing businesses at the same address, than the differentiating items will be the name, the phone number and the website landing page the Google My Business listing links to. Being sure that all 3 things are unique should help Google keep them separate, ideally. Hope this helps!