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mik, I notice several of you images are taken with flash and are underexposed. I sometimes have problems with under or over exposed flash images. I usually take some test shots of leaves or other neutral subjects then adjust the flash setting to give correct exposure. No idea why the camera/flash system gives the wrong exposure and why it is sometimes over and sometimes under (its nothing to do with light or dark backgrounds, that is a separate issue which you can predict and adjust for).
In recent sets of images i've had to choose adjustment between +2 and -1 for apparently similar pictures, however sets of pictures within a short period tend to require same adjustment so the test shot method works.
Lat/Lng: 50.8, -1.3
OS grid ref: SU5302