As Ro said I live in Widnes, Cheshire. The ONLY other company I could get to quote was Adrian Flux, who were £600 more expensive.
I tried some of the other insurers people had mentioned on here but due to insurers changing their criteria and premiums increasing, none would even quote.
A Plan gave me a great quote on a similar spec car 2 years ago. Now, the same underwriter won't do more than 35% over standard power and no more than 25% of car value on modifications. This is how much the insurance game has changed recently.
If you get cheaper quotes elsewhere, living in different places with different spec cars, well done to you.
In my circumstances, my area, my car, Sky were by far the cheapest, enabling me to buy the Supra.
Rgds
James