Two interlocked clues are stopping me from finishing this.
20,21d)Genital warts trouble spots, short hour required for treatment. (7,7)
B-O-*-N S-R-*-S
27ac)Run round back of loo given little time and caught short- reason for shitting yourself?
*-T -*-R-
(The shared letters indicated by asterisks are in the correct order, ie-the first one in B-O-*-N = *-T etc.,).