Access control system

An access control system which includes

• a cubicle defining portion (14) mountable adjacent an access opening (28) in a wall (19) of a premise, the cubicle defining portion (14) defining a cubicle (24) having an opening which is arranged transversely and adjacent to the access opening (28);
• an extension member (18), extending from a side panel (15.2) of the cubicle defining portion (14);
• a closure member (16) pivotally arranged relative to the access opening (28) to be pivotal through a predetermined arc (‘A’), an included angle of the arc being an acute angle, the closure member (16) being pivotal between a first position at one end of the arc in which the access opening (28) is closed off, and a third position at the other end of the arc, in which the closure member (16) lies substantially in the same plane as the extension member (18), past a second, intermediate position, characterised therein that the system comprises
• a locking mechanism (34, 102) which is operatively mounted relative to the closure member (16) for locking the closure member (16) in the second position, so that an end of the closure member (16) divides the opening of the cubicle (24) into part openings;
• and
• a releasable obstruction member (44, 118) which is associated with the locking mechanism (34, 102) to releasably obstruct movement of the closure member (16) from the second position to the first and third positions.