should i pay off more of my mortgage using my ISA??

ill try and simplify as easy as i can.

iv got an 85k mortgage. paying £555 a month fixed for the next 7 years (at roughly 5.14% if i remember correctly)
iv got 10k in savings which is my contingency if anything goes very wrong!! I do not and will not touch that!
But iv got 25k in my ISA earning me nothing!

Question is iv overpaid my max for this mortgage year but should i use my ISA to reduce it more now by so get a penalty or annually pay off the max 10% they allow by dipping into my ISA and trying to save more???

Decisions decisions
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