I paid £11k for mine, I think the list was £12,5k or something. Very expensive for what it was, especially by today's standards, but cars are so much cheaper now than they were then.
A friend of mine has just changed his MX-5. He had a '94 mk1 (1.8S) which at 2.5yrs old had cost him £10k in 1997. He has just bought a 2.5yr old 1.8S (top spec) with the same miles for £9.5k, that's 9 years later!