[jInflux]

Not illegal in the UK:

https://www.gov.uk/overtime-your-rights/overview

[varjag]

There's still a cap on 48 hour a week however:

https://www.gov.uk/overtime-your-rights/compulsory-overtime

and after that the employer must obtain signed consent of the employee, otherwise it is illegal. So the original point of "shaming into OT" stands.