If you follow the link to the ZA page of this website,
UK Serials and scroll down to ZA670 - 721 you can see what happened to all of our first 33 aircraft. By clicking on the 'i' at the end of each row you will get an explanation of the fate of the airframe. One third of the original delivery have been written off to various accidents or incidents.
The newer airframes can be found in the ZD and ZH pages.