Not all Valiants were fitted with tanks. I do however have (in a book) a picture of 816 both with and without tanks. In the with tanks fit she also had a probe.
XD816, a B(K)1 was the last Valiant flying as it was undergoing a Ministry of Technology test programme.
According to the book, 816 flew on 28 Apr 1968 in a flypast to mark the disbandment of Bomber Command.