Unfortunately, when I arrived I noticed that I only had little charge in my phone. It asked me if I wanted to go into "low power mode" and I said yes. I believe that is why the GPS cattle map would not work. E.G. it solidly said that the cattle were at a location that I checked out several times and they were not. I tried refreshing several times and closing the app, bit to no avail. It also maintained that I was positioned right beside the compound for the whole time too.
On returning home and plugging the phone in to charge, the cattle's location moved and it also showed my correct location. So I believe that the issue may have been with "Low Power Mode" on my phone and not the cattle's collar/GPS system.
I initially found two ponies in the wood S of the track in D5. They allowed me to approach photo and one of them seems to enjoy/endure a neck stroke for about 30 secs.
I then rode, (Mbike not pony) round to the nearby compound, where I found the remaining five ponies in the NE corner of D6 and NW corner of D7. "SL" was particularly friendly today allowing me to stroke her neck and clear her mane for several minutes. All ponies were grazing and appeared content.
I then went looking for the cattle, with no GPS location info or luck. My search included all on the main tracks and a circumnavigation of the whole perimeter. I suspect that they were probably in the woodland around K5, which is very wet and I didn't access or the woodland in the NE of the area.
Before leaving I returned to the compound area where I found all 7 together in D6 & E6 and one of them was on top of the bund around the compound's western perimeter. I took two photos of this pony from each side of the bund.
On return home, (circa 12.00) the GPS tracker map showed the cattle collar on the main NW-SE track in J4. At 14.04 it is shown to be on the border of J2 & J3.