I cannot finish this off, even though the clues look as though they can be worked out.
27ac, 'They bring comfort to peepers wandering by the sea', (8), ?Y?B?T?S;
40ac, 'Osbert's sister liked it here? Not entirely', E?I?H. EDITH?
50ac, 'This country with crest depicting Wodehouse character', U?R?A?E