Excellent post Gareth
As you may recall, I purchased a Mk1 Vulcan a couple of weeks ago from a fellow BBS member.
(http://www.airgunbbs.com/showthread....-Vulcan-Mk1-22)
The Vulcan is one of those guns that I really should have bought when they first came out back in '79, but at that time I had a Mk3 Hawk
I have to agree with ggggr in that many of the parts were the same and interchangeable on both rifles.
I found that the .177 Mk1 Vulcan that a mate had at the time, was without doubt, more powerful than the Hawk, but also that the firing cycle seemed smoother and quieter.
Another thing I've noticed on my Vulcan is that there is a pressed metal plate that sits between the trigger guard and the stock; I don't recall this item on the Hawk
As for prices, I remember the Mk1 Vulcan being sold at Jim Johnsons Norbury shop for £45.95