I agree with Leigh - at present employers do not care whether an applicant has a degree or not, they only care about the quality of the work in the showreel. Having said that, for most people a full degree is the only way to get the time to create artwork that can reach professional standards, and even more importantly gain access to people who can teach the relevant art and software skills.
It’s very hard to give full advice without seeing your work, you may well have achieved a quality level that will get you work. On the other hand it’s rare (in my experience) to find people who have done Foundation Degrees that have achieved that level of quality in only two years, especially as the quality level required to pass foundation degrees is lower than normal degrees. One hard way to discover this is to send your work out to companies… another way that can be less painful would be to post your work on forums such as CGTalk for advice and opinions from professionals so that you can improve your work to the level that can get you employment.
You may not need a full degree (although you may require qualifications in the future if you wish to work outside the EU zone), you might only need some professional advice, some training DVDs and some time to work on your artwork at home. It all comes down to how motivated you are.