Checking Chris Thrale's book, the tyro (and a different walnut "Custom" sporter stock from the prior Special and Deluxe ones) was announced in November 84, and still advertised two years later. 1986 prices from Streatham Armoury (remember them?) ranged from £72 for a basic Vulcan to £130 for the tyro. As Chris suggests in his book, it's hard to imagine many of the tyros selling at that price.