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Topsham is a large village / small town on the Exe Estuary just south of Exeter. The town has a long history, it was a Celtic settlement, then the Roman port for Exeter. It was an important Saxon settlement and the church dates from the 10th century. It remained a port until the 19th century. The town has a variety of interesting architectural styles and numerous Listed buildings. Link
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The River Clyst rises near Cullompton, the river runs west and southwest, flowing through the settlements of Norman's Green, Plymtree, Clyst Hydon, Clyst St. Lawrence, Westwood, emerging in the Clyst Valley.
From there, the river goes southward through Broadclyst, West Clyst, Clyst Honiton, Clyst St. Mary and Clyst St. George, eventually flowing into the Exe estuary at Bowling Green Marsh, immediately south of the port of Topsham near Exeter.

Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.

In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.

In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.

In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)

Read more at Wikipedia Link