Welcome to the board Steve, the Zed is a cracking car and can be a lot of fun. I'll just echo what the other guys have said, don't rush to buy the first one, consider the running costs involved and have a good read through the FAQ's on the site here.
It might be a good idea for you to look through the cars for sale here, like Ian's car, so see what's available. If you bought from someone on the forum you can be pretty confident the car's been well looked after. Even if you don't buy a car from the forum, comparing the cars here against others you might see will give you a good yardstick on condition, value for money etc.
All the best with the search