The aylesbury arm of the grand union canal was completed in 1815. The project took 20 years to complete, 17 years of negotiations and 3 years to build. The completion of the canal had a profound effect on the economy of aylesbury and the surrounding district. Information and photos about the towpath, walks, bridges, feaures and locks on the aylesbury arm of the grand union canal in england. The aylesbury arm starts off from the grand union canal at marsworth junction (at the canal bridge along watery lane hp23 4ly i. Close to the b489) and runs for 10 kilometres across the countryside to arrive in the centre of aylesbury in buckinghamshire. The canal was built at the end of the 18th and beginning of the 19th centuries, providing a more direct route between the 2 cities. The grand union canal (as it is now called) has several arms or branches, these were often built independantly but have been amalgamated over the years to form the current canal. 8km stay safe stay away from the edge dry dock flight of locks aylesbury wendover birmingham grand union canal aylesbury arm grand union canal the grand junction arms bluebells tea rooms the red lion startops reservoir marsworth reservoir tringford reservoir tringford pumping station (not open to the.). There are several canal arms branching off this canal such as wendover, aylesbury and slough. We have not travelled the full length of the grand union canal yet but we have spent many hours enjoying what it has to offer. This stretch of canal is an off shoot of the main grand union canal, and splits away in the vicinity of marsworth and then heads west to aylesbury via wilstone (), puttenham, and broughton.