If you work for this company and have worked there for 2 years or more, take your employer to tribunal. This is literally breaking UK law.
Working Time Regulations guarantee employees additional weekly rest periods. These can be either 24 consecutive uninterrupted hours for each 7-day period or 48 uninterrupted hours for each 14-day period.
You can get this changed but it can only be changed via an elected employee representative in a collective workforce agreement which I sincerely doubt they have.
At an individual level you can opt out of the maximum working hours component which stipulates nobody can work more than 48hours per week on average (over a 17 week period). But you can not opt out of the rest of the Working Time Regulations on an individual basis. Your employer can't force you to sign this either or punish you for refusing to opt out.
Any employees at this company who have worked there for more than 2 years are entitled to take this to workplace tribunal, which they would win. Once the new laws come in this will apply to all employees of any amount of time worked at the company because they're removing the 2 year requirement to take employer's to tribunal as it's used to abuse newer employees.
