I spoke to jack last week. He's good guy.
Gave me 2 options £290 to make, supply and fit, or £100 to fit a off the shelf one.
He recommended the second option. As they are very awkward and some customers haven't been 100% happy.
Good news is replacement roofs seem to be around half the price they were last year.
Local trimmer (who is extortionately expensive and a bit of a dell boy) quoted around £600 fitted. Was over £1k last year.