Can't decide if we're being silly?

Situation is as follows

Mortgage with nationwide with around 6 years left. Currently on a 10 yr fix at 5.69%.

House is worth around 150k

76k on interest only, 6k on repayment, total redemption figure is 82k

2 endowment plans in place, one with standard life due to mature in around 4 years for 36k, expecting a shortfall around 12k on this. Current cash in value is 14.5k

Another endowment for 40k due to mature in 6 years, not such a large shortfall as it is split into 2 x 20k plans. Expected shortfall around 8k for both. Current cash in value is around 23k for both.

We have some work to do around the house and figured if I cashed in all the plans, paid off a large lump of the mortgage, and converted 50k to complete repayment over 10 years and it would still be around 100pm cheaper if I for instance was able to get the Yorkshire building society 5 yr fix at 2.44% (although that does have fees of £1345)

Am I missing something? I know I'm extending the term of the mortgage but was are still in our early 40's and at least it takes care of the shortfall and releases some funds for home improvements.

Or should I hang on and wait to see how the endowments do? Can't decide!!