The path directly opposite the station leads to what is now the main gate of Bletchley Park. This is now opened to the public every other week-end by Bletchley Park Trust.
From 1235 Bletchley was part of the estates of the De Grey family around their house 'Water Hall' at Water Eaton although their main home was (and is) at Wilton in Wiltshire. In 1616 the estates were granted to De Villiers the then Duke of Buckingham. In 1674 Bletchley was sold to Thomas Willis who practised as a surgeon in London. His grandson, Browne Willis built a mansion on the site, which it seems was never occupied and did not long survive his death in 1760. He also initiated the ornamental lake.
The current mansion was built as a bailiff's house about 1860, extended in 1883 and further extended around 1906 for Sir Herbert Leon, who born in Hamburg became a wealthy London financier, newspaper proprietor and Liberal M.P. for Bletchley. It is constructed of brick with stone dressings. The front is a hotchpotch of gables including a large two storey angular bay with a lead roof. It was here during the 1939-45 war that the decryption of the Nazi Enigma code played a large role in counter- intelligence. The huts from that time form part of a museum operated by the Trust. Bletchley Park can claim to be the birthplace of Information Technology for it was here that a GPO team led by Bill Flowers installed the first electronic computer used for a practical purpose. Alan Turing, a pioneer of computing, was among the celebrated people who worked here. The lake in front of the house was landscaped in the days of Browne Willis, an antiquarian. There is now no trace of his house 'Water Hall' built in the Queen Anne period (1707).