Bletchley and Simpson were both old Saxon settlements, mentioned in the Doomsday Book. Their parish boundary was along the Watling Street. At that time main roads like Watling Street were considered dangerous and people did not like to settle by them. During the 12th Century the country settled down, became more peaceful, and the road then came to be seen more as an opportunity than a threat.

Fenny Stratford grew up and became a more prominent place than Bletchley, though it remained divided between Bletchley and Simpson parishes. Inhabitants still had to take a footpath along the line of Church Street and Western Road to go to attend services at St Mary's, Bletchley. Browne Willis, the lord of the manor at the beginning of the 18th Century, could see that, unless he did something about this, the population would become non-conformists and go to chapel instead. He therefore built St Martin's and about 1730 Fenny became a parish in its own right.

The coming of the Grand Junction Canal (which reached Fenny in 1797 and was completed in 1805) further increased the importance of Fenny Stratford. This did not last long, however; once the London to Birmingham Railway was opened in 1838, it began to take trade away from both the road and the canal. The coming of the railway, particularly the establishment of a junction and an engine shed at Bletchley, marked the start of a transfer of importance from Fenny to Bletchley.

During the early 20th Century, development along Queensway (or Bletchley Road, as it was then called) effectively merged Bletchley and Fenny Stratford. Fenny Stratford maintained its own Urban District Council until 1973 when the Borough of Milton Keynes was created but its fortunes have become increasingy coupled with Bletchley and they now both come under Bletchley and Fenny Stratford Town Council a subsidiary authority within Milton Keynes.

For more information on Fenny history, you can look at the following sites: