I had a look on over 20 Salix fragilis (Crack Willow) trees on the edge of the area marked as Poolmead on OS Explorer map 129. GR is ST421277. I found Phyllocnistis saligna mines on leaves and adjacent stems of a single tree which had been flail mown in spring and had lots of young secondary growth.

There were no visible mines on the older growth. Perhaps S. fragilis pollarded the previous year would be a rewarding search.

I couldn't find Scrobipalpa acuminatella on any of the thistles in that area.