On Level 2 are two services which track subsequent amendments to acts
Halsbury's Statutes :
Classmark: KZ 2
Multi - volume work arranged by broad subject area. Has statutes as amended and annotated with a looseleaf updating service.
Current Law Statutes annotated
Classmark: KZ 5
From 1947 onwards. Arranged by year. Contains statutes as originally enacted with annotations.
If you want the text of an act as originally promulgated, you will find them on Level 1