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Dear So and So,
I am writing to enquire after the availability of full time employment in "The Firm's" Harvey Bay offices. My family and I are relocating to the area, and having worked for The Firm for 3 years previously, I am interested in returning in some capacity.
Ideally, I am looking for a position that will allow me to pursue the practical experience necessary to gain my drafting license (??), with the view to project management.
Since leaving The Firm X years ago, my main focus has been ....... . I feel I have attained the experience in my current role required to move forward with my career and am interested in moving forward with The Firm for the long term.
I have also attached my full resume for your reference and look forward to hearing from you soon.
Yours sincerely, etc etc.