I really didn't think that anyone would know where the pictures were taken, well done Adam it is indeed the Chichester ship canal in West Sussex, here is a bit of history and a link to a site all about it http://chichestercanal.org.uk/canal-history.php
What is known today as the Chichester Canal is in fact part of the former Portsmouth & Arundel Canal.
This was opened in 1823 and consisted of a 12-mile canal from Ford on
the River Arun to Salterns and a shorter cut from Langstone Harbour to
Portsmouth Harbour, connected together by a 13-mile dredged ‘bargeway’
through the natural harbours and channels between them. Intended as a
key link in a through route to London via the River Arun Navigation, Wey & Arun Junction Canal,
River Wey and River Thames, it was not a success. By the time it was
built, there was no real need for an inland route as larger and better
ships, coupled with an end to hostilities with France,
meant that the coastal route was an easier and cheaper option. One of
the few regular through cargoes carried was gold bullion from Portsmouth to the Bank of England, with armed guards on the barges.
Here is an easy picture for you to identify