Hi juliwoolie - pretty sure there is, looks like they've got 2 and 1 a bit mixed up - I eventually gave up as I'd run out of tippex ! No doubt they'll grovel next week....(again...)
Just completed it.
If you put an extra 2 at the bottom of columns 3, 4, 5 ,26, 27 & 28 it works. Obviously left out a line of type!
There are 7 'B' drawn in the answer.
Quite possibly, If I can work it out then they would probably receive enough entries to draw a prize from. When they missed a line of type once I rang them and was told it would still be valid.
HTH