If you have lots of partridge around then maybe a female Lanner might be worth concidering. Captive bred Lanners tend to get lure bound VERY quickly, and getting a longwing fit and entered quickly requires experience.
If you are serious about hunting a longwing then Peregrines, Sakers and Pairie falcons are generally easier to get hunting with. But you will need a lot of country, ideally a good point/flush dog, the best telemetery going and a lot of time. My first season with a longwing was many years ago, and I did not catch much, but I learnt A lot.