I came across these and, just out of interest, I thought some might enjoy these works on the validity of Anglican Orders from the Roman Catholic and Anglican perspectives:

http://www.newadvent.org/library/docs_le13ac.htm
http://web.archive.org/web/20090807095328/http://www.ucl.ac.uk/~ucgbmxd/saepius.htm

 ​To my mind, Archbishops Temple and MacLagan have the better of it: Leo XIII's argument would be true of Catholic ordination rites in certain times and places. There is also too much emphasis on Cranmer's and the reformers' private beliefs or supposed intentions and not on the forms and rites they devised in the Roman Church's views on the subject - which is irrelevant to the validity of the orders. But, of course, the shameful ordination of women bishops means that this will soon not matter, and the Anglican Church will definitively lose all Apostolic Succession and any chance of proper ecumenical outreach to either the Roman or Orthodox Churches.