"I just wanted to let you know that I have landed that career defining role I have been looking for and to thank you for your inspiration and guidance.
I will be starting next week as Lead Electrical Engineer for the company XXXX based in sunny Rockhampton, QLD (yes, a big move from Melbourne!). The role involves electrical and automation design for underground mining machinery mainly used for coal mining and will be supervising a small group of other electrical engineers. It is a big change, a big role, a big company and I'm really excited about it. They also have an established professional development program and are keen to send me to the US and possibly China for further development. The salary is good, the people are nice but professional, the conditions are good, it really ticks all the boxes on my career objectives that you helped me define. Hugely exciting 
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You will be pleased to know that I was also offered another role in Melbourne, but this one was "just a job". Initially I accepted the offer but persisted in my efforts and was able to land something better. It was so nice being able to tell them a better offer had come my way.
I value greatly the career planning and advice you provided, but it was really your great inspiration a connection you were able to make with me that made the difference. I look forward to seeing you again when the next career challenge comes my way.
Kind regards,
M.L."