What would you do in this situation?

swindiff

I was in a similar situation in 2016 when I was 46 and my DB pension also started offering a DC part to the pension, making it a hybrid scheme.  To entice us to start saving extra my employer offered to match the 1st 1% into this DC scheme so I started off just matching the 1%.  It dawned on me over time how much tax and NI I could save if I upped my contributions.  I gradually upped it over the years, and am now salary sacrificing 23% into this DC part of my pension.  I have kept a spreadsheet of all my extra contributions and what it has actually cost me in reduced take-home pay. 
It has cost me just over £51k in reduced pay, but thanks to Income tax and NI savings and decent growth over the years, my pot is worth just over £120k.  
My mortgage in 2016 was £125k, it is now £94k.  To simplify things, if I assume all my pension overpayments were equal over the 8 years, that is around £530/month that I could have overpaid my mortgage.  That would mean at this point in time I would still have £37k left on my mortgage.
So my mortgage would be £57k less, but I would not have a pot of £120k in my pension.  By prioritising my pension over my mortgage I am £63k better off.  

Kernowshep

Also worth noting that the AVC linked to the LGPS can be taken 100% tax free when taken at the same time as the DB pension (up to the limit of approx 25%, of 20x the annual pension amout plus the AVC amount ). In a lot of cases it can be made by salary sacrifice adding an extra boost.