Hi Rob,
Being near Wellesbourne will certainly help you see Flarm equipped traffic that you wouldn't otherwise see, but it certainly shouldn't make all your traffic appear as if from a Flarm source - which is what your Traffic Table 'appears' to be showing. From my experience, if, for example, you were running PowerFlarm Core, connected via your PilotAware, ADSB traffic would register as CSA-F, not simply as ---F.
Regards
Peter