I need a pinion drive gear complet with clutch dog nut?

When you did a search to try and halp yourself, you must have missed these:

http://www.espares.co.uk/search/mt265pt1757/blenders---mixers---juicers/small-appliances/gears/kenwood/chef

http://www.4kenwood.co.uk/chef-spares/a701a/catalogue.pl?path=71679,228604:264523

There are probably more out there but I suggest you search for yourself. Try "Kenwood chef A701A spares"

XXX
January 2016

Try Kenwood customer services

Good Luck...
January 2016