I've found a very cute photograph of Jonathan and his co-star Abigail Cruttenden from "Centrepoint". "Centrepoint" is a four-part British television thriller first broadcasted on Channel 4 in October 1990. Jonathan plays a young man faced with the task of avenging his fathers death, helped by his girlfriend. I haven't seen this series, and it wasn't released on DVD. 

Jon was quite a good-looking young man. He is still just as handsome as he used to be (only a little bit older).