Not true, call100. Most of the DH 'slackers' are part of the same staff group (negotiated staff). You are talking about Middle Managers and BRG, not all of whom live in DH. What you've failed to mention is that this staff group still have the opportunity to pick up £500 over the next 5 months depending on sickness absence - a one off scheme offered because the bonus pool was not created.
I have difficulty with the accuracy of the targets set and the business planning, but I do applaud BHX management for the above. If a bonus pool is not generated, they don't have to offer anything else but have done so in the last two years.