Possible but there will no doubt be penalties, how much depends on your product. Unless you've got a huge mortgage and have a big lump sum to pay in or you have found a very good deal I would imagine that your penalties and charges will far outweigh any savings you will make over the next 8 months from your new mortgage.
Check your conditions, but be prepared to bite the bullet and wait till the end of the fixed period when you are free to move.