Hello Big Dave44
If you are referring to the GKQuick as published in the Saturday Telegraph today (but un-numbered), then the version in the paper works with a 13x13 grid. Perhaps the clues on-line are a problem, in the paper the first 2 across clues are;
1a Barrel like container, 3a Grow weak.
This might help with drawing the grid b=blank L= letter from down clue
Row 1,1a, b, 3a
Row 2, alternate squares L, b, starting and ending L
Row 3, 9a,b,10a, b ,L
Row 4, As row 2
Row 5, 11a, b12a, b
Row 6, L, 3b, L, b, L, 3b, L, b, L
Row 7 14a, b, 16a.
Then symmetry for the bottom 6 rows, ie reverse of rows 1 to 6, hope I got that correct.
Thanks for taking the trouble, Doc, but I managed to finish it OK - made it more interesting than usual. Your description may help someone else though.