Paul, noted you were in Scotland and you were searching ebay for a car. Have you tried gumtree? Try this advert, if its still for sale it looks and sounds like a goodun. Of course due to different wheels you will have to get the ok from the senior forum members as to whether you should buy it or not.
https://www.gumtree.com/p/bmw/bmw-z4-2.5i-only-55k-miles/1287540557
https://www.gumtree.com/p/bmw/bmw-z4-2.5i-only-55k-miles/1287540557
