Valuation change in LTV - better % rate on remortgage?

Hello people.

We bought our house in 2010 for £197,000.
It was on the market for £225,000 and most houses in the area are valued £220-225k.

Can I use this difference when looking at LTV and remortgaging?

We currently have £170k remaining to pay and our rate is the SVR of 3.99%.

If I could reach a better LTV say 75% then it would open better rates up to me.

Any advice appreciated.