No other western country pays so little towards it's cultural heritage as the UK does.
It means that in virtually every instance all of the burden for the excavation, etc., falls on the developer.
It's a rotten system, as feralpig says, the ' archaeology ' greatly interferes with the construction process....and it's not all black and white, because like robbing Peter to pay Paul, the business aims for an overall profit, sometimes you win, sometimes you might scrape an even draw, some you lose, and only if the balance is always in the loss does bankruptcy follow.... but the alternative is that the remains are literally trashed, and we all lose the connection to our ancestors, to our own heritage, to our history.
The presumption is in favour of preservation in situ. If it's known about in good time, fine, builders can build around it/ over it, and not through it.
Thousands of houses are built on old burial sites. Quietest neighbours you'll ever have, as they say. The graves can be left undisturbed and folks just use the land above.
However, when the building work does reveal graves, as it did at this site, then some kind of accomodation needs be made.
Personally I think we ought to build more on reclaimed brownfield sites, and leave the country's green lungs to thrive; but I'm neither a housebuilder nor now a housebuyer. Easy for me to say what they should do; might be a different matter if I had a growing family and really wanted out of a scheme, estate or inner city.
M