None of the English version properties cost £25. The cheapest is The Old Kent Road or Whitechapel both @ £60. Maybe you mean the fine for landing on it if it's not yours??
Well the letter total is indeed 25 but if you start in scrabble don't you have to cover the central bonus square? I don't have a board but there will be a double letter or word in there somewhere to bump it up.
If you put the Q on the double letter score and pass through the double word score then you would get 70 points + 50 points bonus for using all 7 letters = 120 points.