Thanks everyone.
I did fly down to look at the yacht on Saturday. The picture of the engine is misleading. The yellow string is the engine stop and the cable tie is there to tidy things up. Other than that the engine setup is very clean, well organised and easily accessible compared to others I've seen. There is superficial rust on the shackles but up close they look more than adequate. After seeing the boat , the rigging was my biggest concern although the shackles themselves looked fine and more than adequate up close apart from superficial rust. I thought, with my very limited experience