on the 25 k u earnt u would pay approx £6,028, (inc ni) this is assuming u had tax code 6035L
on the 8 k u should pay no tax, as u will have paid enough tax for what u earnt
as they will take the tax year as earning 33 but the amount that is un taxable is 14k leaving 19 tax on 19 is just under 6 grand, u might get a couple of hundred if u are lucky
this is just rough