Mine and feeding out of mine in Hawthorn. Upper surface of leaf only eaten.
No interactions present.
I think you have 2 organisms here, neither of which is Bucculatrix bechsteinella (formerly crataegi) The Bucculatrix mine is tiny and usually associated with the midrib. At the "grazing" stage I don't think the larva would feed over such a large areas of leaf. The mine is almost certainly one of the Nepticulidae and if the frass is a reddish colour it is probably Stigmella crataegella.
Many thanks Robert, looking at it again I am sure your right
Lat/Lng: 50.5119, -4.3198
OS grid ref: SX356705