This part of England was not under military control; there were no anti-Roman leaders in this area so there was little need to maintain any military presence here.  Most of the Roman legions moved out to the Welsh and Northern frontiers where fighting continued. 

People found themselves part of the new Roman province of Britannia. The South-East very quickly returned to the status quo with the re-establishment of Atrebatic client kings (either the former local king Verica or the new king Cogidubnus) and the establishment of Roman civic life based on the previous tribal territories.  The Atrebates territory being restored to include most of the land from the Thames to the South Coast.  So by this date our local tribal leader was culturally very Romanised (both Verica and Cogidubnus had lived in Rome and were no doubt Roman educated and Latin speakers).

The major towns roads and British tribes in Roman south-east England. On Cogidubnus' death, ca. AD 80, the Romans divided his kingdom into three civitates. Our area remained part of the lands of the Atrebates, with their capital at Calleva - which now became a Roman town known to us as Silchester.  'Regni' was a Roman-created administrative centre based at Chichester - not a British tribe. Map: David Stokes

In AD 61, in revenge for the 'assault' on her daughters following the death of the King, Queen Boudica marched south and sacked London.  Her armies may then have turned south-west, sacked Staines and possibly Roman buildings at Silchester ³, and a good case can be made for the last battle being fought somewhere on the Silchester road.^{1 p166}   So it is conceivable that Boudica and her army passed along the Roman road through the north of our area on their way to their defeat.

The 4th C AD is regarded by some as a 'golden age' for the elite of this part of Britain; both in terms of prosperity and the internalisation of Roman culture. ² But prosperity can also bring unwanted interest.  The inhabitants of Silchester found the Iron Age ditch defences insufficient and built massive masonry walls (which can still be seen).

Following the withdrawal of the Romans, administration seems to have collapsed: we have no record of local rulers for the next 250 years.  It may be that the Christian church was the only remaining national organisation.  Silchester appears to have been inhabited for a couple of centuries but without the the Roman towns and roads its position and purpose was no more.

References:

1    The Archaeology of Surrey to 1541.  Ed J & D Bird. Pub: Surrey Archaeology Society 1987

2    The Heirs of King Verica, Culture and Politics in Roman Britain.  Martin Henig.  Pub: Tempus 2002.

3    Michael Fulford reports that the courtyard building at the Forum in Silchester was burnt down at roughly the time of the Boudiccan revolt.