Lump sum off mortgage or save it

We have a lump sum of about 8k. We have a mortgage, tracker, with 180k left on it. About 29 years to go. We will do faster, but three child payments to make currently, so we have it out at fell term. No negative equity and some value in the house v's mortgage. Have a slush fund in case of one or both job loss, about 30% chance of this for either of us. This fund is 50k. We have 8k in addition and will lose on crèche fee during summer. So would you pay more into the mortgage or put it in a savings fund? Thanks

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