Jackie Stewart believes F1 should be doing more to 'respect its heritage' and work to retain its historic European events following the cancellation of the German Grand Prix and concerns over the future of the Italian Grand Prix.

Since 1996, 12 all-new venues have been added to the F1 calendar - not including returns to updated circuits, such as Austria's Red Bull Ring -, but just one, the now defunct Valencia street circuit, is located in F1's traditional west European home.

With just eight European rounds from 19 on the 2015 calendar following Hockenheim's exit from the schedule, three-time F1 world champion feels the sport should be looking after its heritage.

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"That sounds like me being a purist," he told Associated Press. "But you have to respect history. They should always be on the calendar - it's terrific we have a US Grand Prix, a Brazilian Grand Prix, one in Bahrain, and that we are going to new countries. But you still have to respect your heritage."

In all, three brand new European venues have been added to the F1 schedule since 1996 - Valencia, Istanbul Park and the Sochi Autodrom -, while you have to go back to 1993 and Donington Park the next most recent new European addition to the calendar.