According to Wikipedia it began in 1983
http://en.wikipedia.org/wiki/WarhammerSo, maybe it took about a year before it reached the games shops where I first encountered it, in Coventry. (West Midlands, UK)... I think that the company was always based in Nottingham, UK.
COPIED FROM WIKIPEDIA; RELATING TO 1ST EDITION ONLY;
The first edition, written by Bryan Ansell, Richard Halliwell and Richard Priestly was published in 1983 and consists of a boxed set of 3 black and white books illustrated by Tony Ackland: Vol 1: Tabletop Battles, which contains the core rules, turn sequence, creature lists and features an introductory battle 'The Ziggurat of Doom'. Vol 2: Magic which explains rules for wizards of 4 different levels. Higher level wizards have access to more powerful spells. In this system, a wizard picks his spells at the start of the game, must have the correct equipment (usually Amulets), and as he casts each one it depletes a store of 'constitution' points, until at zero points he could cast no more. Vol 3: Characters introduces 'personal characteristics' statistics, rules for role-play (including character advancement through experience points and statistic gains, random encounters, equipment costs, and alignment) and has a sample campaign "The Redwake River Valley".
Very little world background is given at all and the race descriptions are kept to a minimum, and most of the background given is in describing the origins of magic items . Some notable differences to later editions are the inclusion of Night Elves (later Dark Elves), the appearance of Red Goblins - and that Citadel order codes are given.
The first edition was extended with "Forces of Fantasy" boxed set in 1984.