I used Vulcan Engineering when I had my Fiesta Turbo engine built some years ago, I was very please with the results. He is now based at Brandshatch, below is a link to my engine build, he has a lot of customers abroad so films the builds so they can see for themselves, it was all lightened and balanced aswell but there was a problem with the camera so that part wasnt filmed.
He builds most engines, some good pintos and crossflows, check out his other videos, this link is an amazing repair on a Gordini head
Although I didnt get him to build the Escos engine, I had a Cossie specialist build that