I took the BSc course because my grades were not high enough for the MSc course. However, it is possible to be transferred from the BSc course over the the masters. If I remember correctly, if you complete the two years of the BSc course, you can then be transferred to the masters, which will take another two years to complete.
There is alot of competition for this route though, and interviews to go through. If that fails, finish the BSc, then take the masters for 1 year after. There would be funding issues with the second route - masters tuition fee and no loan, rather than the lower undergrad tuition fee with loan with the transfer route.
I must warn you though, if you do decide to take this course at Nottingham (and most other biosciences), you will be going to the "farm" campus - Sutton bonnington - 10miles from the main UP campus. There is a free shuttle bus which takes 30mins from the main campus, but I had to live there for 1 year and it was too secluded for me.
Also, the course is very much biochemistry based for the first two years, and very little reference to actual food you eat. So you would complete the course not really knowing much about food, but more to do with food components - "sugars, protein" etc.
Hope I haven't put you off?