10a) Sow in small unfinished Siamese house? (7) ??A?T??
12a) Engineer ponders over tube in finished articles (3-8) ??? ???D?C??
14a) Drive forward - the Spanish went in front (9) ??????L??
14d) Undo rear end from charm? That's nit-picking (9) ????I?E??
16a) Let's assume diner covers most of UK to find utensil (9) E?G??????
All help greatly appreciated