Parkland roses used in breeding

The Agriculture Canada Parkland rose breeding program is more than 40 years old, and with the English (David Austin) roses it must be the longest one in existence. I am planning to write an article reviewing its contribution to rose growing in cold climates. I may include a section on its value for further breeding programs, so I would like to hear about what cultivars have been useful for further breeding. Conversely, what cultivars that have been of limited or no value.