I just went on their website and looked at some of the restorations...B.E.A...UTIFUL!!! The Hawker biplanes from the 30s were some of the most beautiful aircraft ever built, in my humble opinion...with all the work involved in those older restorations, I can understand why the Yak has taken the bench...the website said that the original engine was remarkably preserved, but that all the magnesium components had dissolved, so they had to work a swap with the Musee de l'Air to get the necessary parts. I wish them the best of luck. Thanks for the reply! Here is their website if anyone cares to look... definitely worth a look...
http://www.historicaircraftcollection.ltd.uk/index.html