Nothing official yet but its rumoured to be 18th October this year. And another rumour is she will be escorted by 9 red planes plus another Avro. Just to reiterate, these are RUMOURS.
The weekend before, a planned North/South tour is supposed to be happening but they need £75000 in total funding for it, so im asking, if you go and see her flying please donate - even if its only a couple of quid.
I will post more when its confirmed.