Yeah this shouldn't be a problem at all. I was due to go to Uni 2 years ago, and went to my interview for Manchester with them thinking I was going to start in September, then I took a job and deferred for a year, (I wrote an e-mail to them and then called up the admissions office for my dept), then I found something else I wanted to do halfway through my first gap year so realised I wanted another year off, so wrote them a second pleading letter and called up admissions again and they said it was no problem and you can defer for up to 2 years. Bingo! So you should be fine!