> Bat. It is well known that the quality of the RP bat vowel has changed since the 1930's. It is now more similar to "cardinal [a]" than it used to be. Hence Upton's choice of the [a] symbol. A more conservative line is to stick with the familiar symbol [æ], but to redefine it as appropriate. That, after all, is what we have all done with the [V] symbol for the vowel of cut, blood, which used to be a back vowel but now has a central/front quality for which the most specific IPA symbol would probably be [6] (turned a).