Hi Karen, I have some bad news for you, in so far as your title hunt and such goes. Even if you do find some dormant title, which I don't think you will (but good luck with your search anyway), you'll then have to prove your right to bear the title and any arms that go with it by a very extensive and exhaustive search of your family history. You'll have to show that you descend from one of Margaret Pole's children, and most likely through the senior male line before you'd even be considered for possible honours.
Just to give you an example, I'm actually a descendant of the senior (Plantagenet) line to the English Crown, but I'd be something like 25000th in line to get it simply because my line splits off the main line with Lady Elizabeth Mortimer, Edmund de Mortimer and Phillipa Plantagenet's daughter. Not a chance in eternity.
Gaining a title is something a lot harder than you may think and they're not given out lightly. There can be a lot of money (and sometimes property) involved in obtaining them. Then you also have to think of the possibility of rival (and possibly more legitimate) claims that might be made.
My advice to you would be to not try and hunt for a title. It could be a very fruitless exercise and one that may eventually disappoint you a lot. What I would do is to be mindful of your family heritage, be proud of where you came from and remember that. It may just be a slim possibility, but the committees which oversee these titles might be looking for someone to take these titles up, and you maybe a possible candidate. If you are, they will find you, but don't go searching for them. Let them come to you. Unless, of course, you have an extremely strong case to put to them.