Bednobs is correct - you took out a mortgage for a full term (probably 25 years) with the first 2 years at a fixed rate. The mortgage will continue at the standard variable rate. With the reduction in interest rates, I can't imagine that you will be paying too much different from what you have been paying. If you can't afford it for whatever reason (bearing in mind, there is a chance that you may even be paying less, it is just that the rate is unpredictable), your best bet is to see what terms are available on your current mortgage i.e. could you extend the term, pay interest only for a while etc.
What you may find, is that by the time interest rates beigin to rise and you need to get another deal, your property may also have risen again and you don't have a problem anymore.