Sadly I've become somewhat an expert in puncture repairs here..quite thorny in places.. so I had thoroughly run my hands inside the tyre and searched outside etc . I've just fixed the latest hole which is unrelated to the others in internal position and did recheck the inside of tyre etc again anyway.
But I'm leaving putting tractor back in it's shed until daylight in case I run over the same darned nail when backing out of where it is.
I was just sounding off over the ill fortune of 2 days apart..
(Oh, and 2 of the wheel nut spring washers snapped as well.. found the bits with a magnet and torch)