For the two European Parliamentary constituencies of Bedfordshire South and Oxford and Buckinghamshire as constituted by the European Parliamentary Constituencies (England) (Miscellaneous Changes) Order 1989 (and described by reference to the parliamentary constituencies referred to in that Order), there shall be substituted the two European Parliamentary constituencies named on the left-hand side of the Schedule to this Order and comprising the parliamentary constituencies which are set out on the right-hand side and which are constituted—
(a) in the case of the Luton South, North Luton, Oxford West and Abingdon, South West Bedfordshire, Stevenage and West Hertfordshire constituencies, by the Parliamentary Constituencies (England) (Miscellaneous Changes) Order 1987 ;
(b) in the case of the Aylesbury and Chesham and Amersham constituencies, by the Parliamentary Constituencies (England) (Miscellaneous Changes) ( No. 3) Order 1987 ;
(c) in the case of the Buckingham, Milton Keynes South West and North East Milton Keynes constituencies, by the Parliamentary Constituencies (England) (Miscellaneous Changes) Order 1990 , and
(d) in the case of the Beaconsfield, Henley, North Hertfordshire, Oxford East and Wycombe constituencies by the Parliamentary Constituencies (England) Order 1983 .