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scented (Matricaria recutita) and scentless (Tripleurospermum inodorum) mayweeds are not easy to tell apart visually, so I like to use the "scent test".
Run a finger tip across the top of the disc flowers and then sniff your finger - scentless mayweed is either scentless or has a faint sweet scent, while scented mayweed usually has a strong aromatic scent.
If the scent test isn't convincing, split a receptacle in half - Matricaria has a hollow receptacle, and TripleurospermumAnthemis is rarer, and has scented foliage.
Lat/Lng: 55.0076, -5.1516
OS grid ref: NW985726