That's not what I meant Jan. I meant IF he brought the tractor back at 10:30(ish), he wouldn't want it known. When asked about it, he didn't want to answer and it may be because he didn't know if he'd been seen - ie. the tenants at the cottages might have identified him as the driver so he wanted to be sure why the question was being asked. When he found out it was just something Julie mentioned, he answered with no problems. Whether the tractor was old or new isn't the issue, it's what he thought he was being asked.
I can see why he didn't answer 'some' questions because Jones kept repeating things, however, the tractor question is different, it was benign on the surface, even Jones was surprised when he said 'no comment'.
I think you could be onto something here.