My favourite potato, but folks aren't joking about being late.... October is the earliest you want to be taking them out, early November even better.... I always grow quite a few because as well as being delicious (they keep the taste in storage too) they store really well (indeed it's a pain getting them to chit).... there are other things you can grow, but I find Anya doesn't keep (it's a second early, why should it?) Ratte doesn't seem to yield as well for me, the obvious comparison is Congo... very similar in a lot of ways except it#'s a deep purplish-black....
I find decently sized PFA's bake perfectly well (and quite quickly) and they do roast, but give them a shake after parboiling..... never bother peeling them, life's too short... scrub them, cut out dirt if it's stuck in grooves around knobbly bits and let the kids help you harvest, they'll enjoy some of the mad shapes they'll find...