you always get 3 years of applecare when buying your macbook over the higher education store. the extra you can pay is only for extended 3 years telephone support (roughly £60)
since you have an apple store near you, there is no need to get the telephone support really. at least I rather prefer talking to someone in a shop than over the phone, considering that you hardly will have any hardware issues anyway.
edit:
AppleCare Protection Plan (Extended Telephone Technical Support)
For up to three years from your computer's original purchase date, the AppleCare Protection Plan (Extended Telephone Technical Support) gives you direct, one-stop access to Apple's award-winning telephone technical support for questions about Apple hardware, Mac OS X, iLife, and iWork.
Service and support from the people who know your Mac best
Every new Mac purchased from the Apple Store for Higher Education comes with complimentary telephone technical support for one year from your Mac purchase date and three years of repair coverage. With the AppleCare Protection Plan (Extended Telephone Technical Support), you can extend your telephone technical support to three years from the computer's purchase date. You can call Apple's award-winning experts as often as you like and get your questions answered.
For complete details, see terms at
www.apple.com/legal/applecare/appgeos.html.
EMEA CC-HE contract uplift MacBook Pro [+ £60.00]