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The outer cross line is faint but definitely irregular, so it's a Brick; in Yellow-line Quaker (the most likely confusion species) it is a smooth line with a kink at the leading end.
Yes I did put it down as a Yellow-line first, but when I studied the photo I thought it was more likely a brick.
Many thanks for the confirmation.
Gardening for Wildlife
Lat/Lng: 54.9, -5.2
OS grid ref: NX0061