Line of semi-mature trees planted in grass paddock.
No interactions present.
Looks more like Populus alba (White Poplar), from what I can see of the sad, wilting foliage: Aspen leaves are almost round, with "cookie cutter" edges.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
... unless this was artifact of the disease.
I'd wonder if it was Populus canescens.
The fastigate habit doesn't help - there are fastigate cultivars of P. alba ('Pyramidalis'), P. canescens ('Tower') and P. tremula ('Erecta').
Lat/Lng: 51.3315, -1.2311
OS grid ref: SU536594