What constitutes a job offer
A job offer can be made in a number of ways:
Verbally through a recruitment consultant or by the company directly
A formal offer in writing
A formal interview accompanied with a formal offer
Job Offers via a Recruitment Consultant or Company
If you receive a verbal offer of employment, you will ordinarily receive a formal letter and contract of employment in the mail.
Sometimes, provisional verbal offers of employment are made subject to the receipt of satisfactory references, security checks and, possibly, health checks. If you verbally accept an offer, you are not bound by this until you have signed a formal offer letter and/or contract of employment.