I've heard rumors that the base rate is due to rocket soon as its been at rock bottom for so long so I would guess a longer period on your fixed rate would be a good bet but you never know with these things.
Whats your source?
Looking at the forecast it's set to rise slower than previously expected?
. I remortgaged last year for a 5 year fixed at 2.49% and the ERC of the first one was less than i would save dropping to the new rate so it was a bit of a no brainer really (if only i'd done 5 years to start with) Oh this is at 65% LTW.