In email Threads my email address appears incorrectly

  PeterSimmonds 13:13 10 Dec 14

For some reason my Mac Air always changes my work email address as it appears in an email thread. In the email itself (above the thread) it appears correctly

So my name should appear as first.last (HEALTH EDUCATION ENGLAND) but it appears in a thread as first.last (Mycompanyname (UK) Ltd.

I used my company's name to register the MAC when I first got it.

Any ideas? I'm stumped!

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