Thank you for the offer to join the Oxford University Biology Department as a member of the research and development staff.

Unfortunately, I must decline your offer. I have accepted a research position with the industrial waste experts Sudge and Weston in Bristol, which is more conveniently placed.

It was a difficult decision for me because I was both excited and impressed by the work in your department. I appreciate the time you and your research team spent to meet me and explain your most interesting work.

Again, thank you for your time.