Bird of prey

Hello. Just on the off chance, is there a youngish bird of prey missing in South Derbyshire, maybe escaped from a falconry? S/he is @ 40 to 50 cm/s tall. Big white chevron like marking on his/her chest. Big yellow talons. Appears to have a long white tag query left foot. Is not that bothered by us humans, our horse, or the dogs, but crying out constantly. Iris