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You may need to go to My Spot - Observations, select this one, and click the Edit tab. If you can't see the thumbnail image, it hasn't attached. You need to repeat the process and wait for it to complete. Be patient - it can take a while.
Once you see the little image appear, you can save the observation.
Lat/Lng: 51.4453, -0.4582
OS grid ref: TQ072729