Is the Jasper Tudor book for general interest or more research? I adore the series of BBC plays Plantagenet by Mike Walker, which obviously deal with the period, although only in tiny, inaccurate flashes ;) But I did get quite interested, aided and abetted by Philippa Gregory.

Like you, I want to try the Vorkosigans, but it wasn't until I read your comment upthread that I realised they might be hard to find over here. Oxfordshire libraries have some, but not as extensive a collection as they do by other authors, and literally nothing electronically, which is just odd. It's clearly very geographically specific!