Wilkie, not always the case now
Yes it has been around for a long time and various councils and associations run variations of the scheme. Most new developments now have to offer a % of Keyworker housing but will also extend the offer to other buyers as you see marketed.
What has tended to change nowadays is the chance to buy more shares and a lot of Associations dont offer this and prefer to hang on to their share of the property ....
That said, its still an option and it is an option that allows me to stay in the village that has been home for 20 years +