I have cold-solved a good number of clues, but cannot get the grid-fill going. At the top, I have 1, 7 and 10 across and 4 , 5, 8, 9, 10 and 12 down, but nothing seems to gel there. At the bottom of the grid I have 24 and 29 across and 18, 19, 21, 23 and 25 down. Where would be the best to start my grid-fill?