D'you know what T,
If you are going to get a bill of that size, why don't you do it yourself. They are alloy and you will be able to strip and refinish ready for painting quite easily. then spray with acid etch primer, then a suitable under coat and then your choice of finish colour. When you are happy hang them in the oven at about 75'C for an hour and that will harden the paint up nicely. Depending on what your draught excluder is, either a couple of strips of closed cell foam or the new profiled seals would need to be refitted. Not a difficult job and probably about £100 if you buy all bits and the paint required. Most of all think of the satisfaction you would achieve!
If you search for me in forum search I have previously posted an article on how to change the lower screen to scuttle rubber seal and that will show you what is required to remove the necessary parts to get at the A pillars. If they are £400 to buy you could probably double that bill if fitting is required. And I wouldn't let a non Morgan familiar person loose on that job if it was my car! Now £700 what else did I need for the Mog?