The directions to the start of the walk are as follows:

Take the A603 from Cambridge towards Barton.  Cross the M11.  Go past a right hand turn to Comberton/Toft.  Immediately after the 40mph speed limit changes to 30mph on a right hand bend, turn left into a large layby.  There is no ‘P’ sign.  It is just before Wallis’s garage on the left.  The postcode for the garage is CB23 7AW.