Whilst the series does give something of a false impression remember that the programme lasts one hour, which is an edited version of three days work.Since the early 1990s Archaeology has in the UK at any rate been largely developer led, whereby they have an archaeology team in in advance of constructional work, and it is of course the developer's objective to get the archaeology work done and out of the way just as quickly as possible.
Less construction work due to the economic recession has lessened the availability of this type of archaeology, and thus led to a loss of jobs in archaeology, and closures of a variety of units.