will a 10 year fix be cheaper then my existing 5 year fix..

03022242

Having seen that some lenders are offering 10 years at 3.44 fixed (60% ltv, TSB no product fee)
i was wondering whether i may be better off going for a 10 year fix.

i took out a 5 year fix 2 years ago at 3.12% with yorkshire BS..
at the time it was 75% ltv, a loan of £105,450 with the property purchase price of £142,500

ive done improvements over the last 2 years and now would be valued at 185k about 56% LTV

what would it cost if i moved from a 5 year fix (with paying an exit fee) to move to a 10 year fix? and assuming that at some point the rates will go back to "normal"

im currently paying £507 if i was to take this 10 year option i would pay £530 (23 year mortgage)