Exit M1 at Junction 14 and turn left towards Milton Keynes. At the next roundabout go straight over (H6 Child's Way). At the second roundabout turn left on to the V11 Tongwell Street. Stay on the V11 and go straight over the next two roundabouts. At the third roundabout go right on to the H9. Carry on straight and at the 3rd roundabout turn left onto the V7 Saxon Street. Stay on the V7. Go straight over the next roundabout.
You will then come to a double roundabout. At this roundabout head along the V7, this runs between Audi Wayside and Tesco's, go under the railway bridge and straight over the next roundabout. After 400 metres you will come to another roundabout. Take the first exit and follow the road round and turn left in to Sainsbury's car park. (This is a pay and display car park).
Walk through the Brunel Centre. When you come out the end by W H Smiths, take a left. The main entrance is about 30 metres up on the left. There is a buzzer which you need to press to access the building, TNG is buzzer number 8.