1 Piece of needlework depicting the life of Harold and including the Battle of Hastings (6,8)
9 Prototype of the helicopter invented in 1923 by Juan de la Cierva (8)
10 Unleavened bread, usually in the form of crackers, eaten during Passover (5)
12 Southern constellation; Jason's ship (4)
13 An incarnation of Vishnu (10)
15 Knitted woollen jacket with buttons up the front (8)
16 Male goose (6)
18 Jewish state (6)
20 The pit surrounding a hair-root (8)
23 Unpleasant dreams (10)
24 An infectious tropical disease marked by red skin eruptions and ulcerating lesions (4)
26 --- Agnew, US vice-president 1969-73 under Richard Nixon (5)
27 One of the Five (or Six) Nations of the NE United States (8)
28 Hertfordshire New Town designated in 1946 (5,9)

2 The --- Brothers, group of outlaws, cousins of Jesse and Frank James, including Cole and Jim (7)
3 Flying saucers (4)
4 Body appointed to adjudicate in some matter (8)
5 The ---, constellation also called the Big Dipper (6)
6 Leap or other movement where a person turns head over heel (10)
7 Once smallest county in England, now a unitary authority (7)
8 Mysterious invisible force asserted to throw or move things about, a noisy ghost (11)
11 A size of roofing slate with dimensions of 22 x 12 inches (11)
14 Italian mixed vegetable soup with pasta or rice (10)
17 Piece of programme music depicting a literary theme (4,4)
19 A form of jazz music with a highly syncopated melody (7)
21 Poisonous organic compound (7)
22 Pungent root Raphanus sativus eaten raw as a salad vegetable (6)
25 Powerful small boats designed to pull or push larger ships (4)