Hi, me again Thanks so much for the help which enabled me to complete the crossword except for this last one (I had one wrong which threw the whole lot out)
20d Decided that 31 across possibly could include an arbitrator(4,4)
31a pop returns unchanged (I have dad for this)
If the Newcastle Evening Chronicle are giving 20 down as 4,4, I am afraid they are wrong - it is one word of 8 letters. I think you should be able to get that without help now, if indeed you have not already done so.