Sorry folks, research I've done in the Carlisle area has convinced me that there never was a Pennington Castle. There was a Pennington family (there is still a Pennington Arms pub in Ravenglass) but they lived in Muncaster Castle. Many 'authorities' have stated that the Taylor family arose in Hants near Carlisle. Unfortunately Hants is a contraction of Hampshire, and there IS a Pennington House in Hampshire that is still owned by (surprise) a Taylor family.
Also, the estate known as Hare Forest is near Orange, nowhere near the Mattaponi River.