ARMS: Gules three Escutcheons Argent the first charged with a Cross of the field the second with a Cross Erminois and the third with a Cross Vert.
CREST: On a Wreath of the Colours a demi Triton winding a Conch Horn and crowned with an antique Crown all Or.

Motto 'TRINIS CATENIS VINCTUS' - Linked in three chains.
Granted 10th September 1956.

Information from Heraldry of the World.

The three small shields and the motto alluded to the parishes of St. Luke, St. Leonard and the Holy Trinity.
The crest refers to Captain Matthew Webb (19 January 1848 - 24 July 1883), he is the first recorded person to swim the English Channel for sport without the use of artificial aids. In 1875, Webb swam from Dover to Calais in less than 22 hours. This made him a celebrity, and he performed many stunts in public.