SUPERINTENDENT BRADLEY had decided Rafferty should hold a press conference on Monday afternoon to tell the media of his progress so far in solving Barbara Longman's murder. Rafferty didn't know what Bradley thought he could tell them. He knew as well as Rafferty did that their progress had been zilch. The farmer, Thomson denied he had been anywhere near the meadow, the Conservation Society, when telephoned, had been emphatic that, not only did they have few male members, but that none of the ones they did have had a forename beginning with 'J'. The alibis they had, thus far, been able to check, held up. According to Shore's personal secretary, he hadn't left his office all Thursday afternoon. And although, because he was away on business, they hadn't been able to contact the chap at the Ch