My understanding is that the engine is a Shvetsov ASh 82, so in a worst-case scenario (when the engine is stripped down), a replacement could be acquired.
While unfortunate, it is one of those things which can occur when high-performance aircraft are being displayed at airshows. Winds were fairly high over the weekend in Marlborough and I understand there was a sudden shift in wind direction just as the FW190 touched down when the incident occurred.
The main thing is that nobody was hurt, the pilot extracted himself from the cockpit and walked away, so a good result under the circumstances.