In one photo of his layout in his home, part of what looks like a Bandon Tank can be seen, partially obscured, so he MIGHT have had one.
There is - strangely - no record of him ever having had any J15 - maybe he thought them too “ordinary”. Not the nearest equivalent, the Midland J18.
It’s known that he retained a very small few models and gave away a few - were looking at a dozen maximum.
His daughter, now 90, retains about 5 or 6 locos, mostly LMS.
It is thought that distant family members have 1 or 2 more.