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I would be inclined to agree with your first impressions and would think that this is most likely to be a Beautiful Demoiselle.
In addition to the relatively broad wings, which appear to be orangey-brown in colour, the position of false pterostigma points towards Beautiful.
Lat/Lng: 50.774542597516, -2.6467502117157
OS grid ref: SY544974
Dorset Wildlife Trust reserve