I would suggest the “best efforts” avoids legal liability in relation to the government itself, but at the same time it forces the government and the department to move in the best efforts possible. I would suggest it's a good compromise. It shortens the timeframe. Certainly, if they've only got a budget for four years, it seems to make a lot of sense.
The key here is not to be too onerous on them. If they can't get the job done...and we've heard that not only do we have a whole bunch of new jobs that have come about as a result of the amendments, but we had a time period set before that was onerous on the department, and now we have more things to do, so it just seems to be a good compromise to try to move things along, which we all want to do. In fact, it was a Conservative amendment proposal.