Not where I live, but where I was born.
http://www.colchester.uk.com/Colchester (Essex, England) was arguably the most important centre of Celtic power in ancient Britain and was home to a Celtic tribe known as the Trinovantes (possibly meaning "The Vigorous People" [Col 96]). The Romans referred to Colchester as Camulodunum which was based on the original British name Camulodunon meaning Fortress of Camulos (the Celtic god of war) [Cooper 94]. At the height of Colchester's Celtic power, in the early part of the first century, the area based around what is now Essex, South Suffolk, Hertfordshire & Kent was ruled over by a Colchester based King called Cunobelin (Shakespeare's inspiration for Cymbeline) [Edwards 94]. Colchester was opposite the Rhine and offered good communications to the rest of Britain, making it a strategic site. It was heavily fortified by means of a series of massive dykes (24Km), the largest of their kind in Britain bearing physical testament to the importance of Colchester. Such was the importance of Colchester in the Celtic world that the it was the prime objective of the Roman Invasion of A.D. 43 [Dunnett 75] which in turn led to Colchester becoming the Roman provincial capital & colonia (a chartered town enjoying special rights and privileges under Roman law). Cunobelin was referred to as Rex Britannorum (King of the Britans) [Col 96] by the Romans, a title that further reinforces the importance of this kingdom at the time of the invasion.
And after a spot of digging...
Brantham: The name was anciently spelt BRAMHAMM, and literally meant one who lived by the Broom-covered hill during the Middle Ages.