Well, nearly there but a few more. Thanks for answers already received.
12A - his values were dramatic (8) I have ?O?????E - Montague has been suggested but I don't get it
24A - sort of a beech from Euripides (6) I have ?E?A??
7D - Fielding's diarist to go over on a T-crossing (7) I have B?I???T (not sure about that)
17D - article she enclosed to doctor in council at Jerusalem (9) I have S?N???R?N
19D - a pagan, I am included in Shaw's people (7) I have G?N?I?E