Well I'm actually in the North of Bedfordshire, not Dustable where the Autodrome is in Thurleigh, the roads are knackered and certainly does punish your car, but its got good grip in the dry.
If your coming from the MK direction, from the WEST. Id recommend doing the A509 (to Northampton) and I'd take the RIGHT hand turn when you hit EMBERTON heading towards CLIFTON REYNES. That's a tight and twisty ***** of a road that you can really get aggressive with without pushing the limits to hard needing to use the other side of the road. Perfect for a front wheel drive car with buckets of grip.
You'll come out in Turvey which you'll cut straight across the A428 heading towards CARLTON (where I am) there's a nice flat out open mile of road outta Turvey which a sharp left followed by lovely sweeping rights before you get into Carlton. Follow the road through Carlton, and go STRAIGHT AHEAD at the cross roads to Felmesham. You'll then come across the best road in North Bedfordshire and my play ground, the CHELLY HILL ROADS. This road has S bends, 45 degree corners, flat out bumpy sections, 2 jumps, and very little traffic with NO speed cameras or police presence.
If your heading from the South, you just wanna take the A6 all the way up till you hit the first round about at Sharnbrook at take the RIGHT up to Bletsoe.
The Autodrome is slightly nearer Bletsoe than it is Thurliegh. If your in the village, then you're about mile too far.
There's also a top bakery in Sharnbrook selling good sandwiches and pasties etc plus 2 local shops and 2 pubs. The nearest petrol station is a nice new Shell station on the turn off to Souldrop on the A6 past Sharnbrook about 3 miles from the autodrome.
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Red circle marks the Autodrome. Yellow dots marks the fun roads.