A very tiny moth.
No interactions present.
Don't think this a Stigmella, it looks too long in the context of its width. Possibly an Elachista species, and with a single white bar and white head it could be adscitella. A key question is how small is "very tiny"? A Stigmella sp would be 3-4 mm in length. If it is a Stigmella, then I don't think you can go to species level on the basis of photographs, unless the moth has been reared from a caterpillar and a known food plant.
Thank you for your comment, but we did look at this moth through a 20x loupe and it did have a yellow head, which is not so apparent in the photos. As for the size, it was about 3-4 mm in length and we apologise for not putting a ruler in the photo.
The one you suggested we looked up on U.K Moths but it is not noted in the Bristol region.
Irene and Tim
Lat/Lng: 51.4, -2.6
OS grid ref: ST6071