Not cheap at all, you'd never have guessed no one stocks them (& what a faf) so I ordered it through Mangoletsi- should be here next week, supplied & fitted for £580.65 arghh!
Turns out that on my insurance policy as part of the company fleet and whilst seemingly great value at £850 per year (fully comp unlimited business mileage) there is a condition that as my car is a non standard UK vehicle my excess on any claim including the windscreen is £500.00 (would have "only" been £250.00 on any UK spec car).
Don't tell the missus!