Will it damage my application if i have previously turned down a job offer?

[mattandbenny]

So basically about 18 months ago i applied for a job as a postie. I made it to interview, which went well, and at the interview i was told i would hear if i was successful after a week. I gave it 2 weeks, but still had heard nothing so assumed i was unsuccessful. I was out of work at the time, having been made redundant from my last job, so after i gave up hope on the postman job i started applying for different things. An agency managed to find me another job very quickly, and i started working there 1 week later (3 weeks after the postie interview).

However the day after i started working at my new job (just over 3 weeks after interview), i received a call from head office of royal mail offering me the job. It pained me as i had really wanted this job as a career change, but felt it wouldn't be right to leave my new job a day or two after starting, so i told them i had another job offer and turned the royal mail offer down.

Fast forward 18 months to the present day, and i am relocating up north. I would love to try to become a postman so have been keeping an eye out on the royal mail jobs, and noticed today they are recruiting in the area i am hoping to move to. So i will be applying for it but the question i have is - Will the fact i turned down a job 18 months ago go against me in my new application for this role?

[POSTMAN]

Would of thought it would be ok.