just fed mine the same mix this morning and thay have done the same left maze, but i will cut there food down untill thay start eating every thing. hope this helps.
how long have thay been missing, may have eggs or young at the loft thay have been in this could be why thay wont come down, birds you get in i would keep them in a while.
yes bbc gave rain other 2 that cover yorkshire area where birds are to be raced from give it clear, will let you no in the morning weather at selby & wakefield. just checked wind map, south for sat north for sunday.