Tammies are fab, they have great characters and are a pleasure to deal with. I keep mine behind electric fence mostly as we have horses/donkeys so I'm not a huge fan of barbed wire. The older sows and boar stay behind a single strand, the younger ones need 2 or 3 strands and to be trained to stay behind the electric rather than run through it to begin with.
We are near Ashford about 10/15 mins from j10 of the m20 pm me or my mob is 07879697792