M1 (from South): Take J8 unless the M1 is busy, then use J6 to M25
(towards M4/M40) and follow M25 instructions below
M1 (from North): Take J8
Then follow A414 through Hemel Hempstead and then take A41 towards Aylesbury
If approaching from South use Junc. 8 unless the M1 is busy, then use Junc. 6 to M25 (towards M4/M40)
From M25: come off at Junc. 20 and follow A41 towards Aylesbury