I found this list of US managed and guarded POW Camps in the UK. Without checking all of them, two, at Bury and Oldham, were previously British controlled camps. I suspect there were, later, others added to this list. Fold 3/WWII/ European theatre army records/5 Geographical Command reports/603dd-Western Base Section. History of the Quartermaster, August 1942-August 1944/ 228. Again, without carefully checking, I seem to think most of these were later handed back to to the British, certainly Haltwhistle, Oldham, Bury, Cummock, Devizes, Swanwick,Rugeley. In time I will confirm these transfers. Edit. Adderley Hall, Shropshire removed 12.7.18. Edit 5.8.20, More precise document reference supplied.