10d - Speed on one's journey (10) I have - E?P?D?????
12a - Jets protrude on board (6) I have - ???U?S
20a - False statement you heard about the place (4) I have - ???U ( could be LIE+U )
22a - Merely without others (4) I have - ???Y ( could be ONLY )
NOTE! 2nd letters of all across clues are 3rd, 8th and last letters of 10d