Thames Valley Archaeological Services (TVAS) was set up in 1988 and is a medium sized archaeological field unit. They have carried out over 2,500 projects in the intervening years. These projects range from desk-based assessments, geophysical surveys, and 1 person/day watching briefs to substantial multi-period, multi-phase area excavations of several hectares in extent.

Website: http://tvas.co.uk/