Query:
INSERT INTO Customer2
VALUES (1, 'Mrs','Jill','Hill','2 Step St','Hillington','Uxbridge',
'Middx''UB10 8XY','020 8999 684') ;
From the little details you gave, this is how that query should look like:
INSERT INTO Customer2 VALUES (1, 'Mrs','Jill','Hill','2 Step St','Hillington','Uxbridge','Middx','UB10 8XY','020 8999 684') ;
You're missing a comma between Middx and UB10